Equiluminant

Equiluminant (pronounced ee-kwuh-loom-uh-nuhnt)

(1) In optics, the quality of two or more objects or phenomenon being equally luminant.

(2) Figuratively, two or more people being judged equally illustrious, attractive, talented etc.

1860s: The construct was equi- +‎ luminant.  As an adjective, luminant means "that which illuminates; that which is luminous" while as a noun it describes "an illuminating agent".  Luminant was from the Latin verb lūminant, the third-person plural present active indicative of lūminō, the construct being lūmen, from the Proto-Italic louksmən, from the primitive Indo-European léwk-s-mn̥, from the root lewk- (bright) +‎ -ō (appended to form agent nouns).  The accepted synonym is isoluminant and equiluminescent is the alternative form.  When used figuratively, although it would make no sense in science, the comparative is “more equiluminant” and the superlative most “equiluminant”.  Equiluminant & equiluminescent are adjectives and equiluminance is a noun; the noun plural is equiluminances (which some list as non-standard).

The prefixes: equi-, homo-, peri- & iso-

The prefixes “equi-”, “homo-”, “peri-” & “iso-” are all used to in same way suggest a concept of sameness or equality, but by tradition and convention, are used in different contexts to produce different meanings or emphasis:  Equi- is used to indicate equality, evenness, or uniformity and is often seen in mathematical, scientific & technical publications to describe something is equal in measure or evenly distributed such as equilateral (a shape having all sides of equal length, equidistant (being at equal distances from two or more points) & equilibrium (a state of balance where opposing forces or influences are equal).  Homo- is used to imply “same” or “alike” and thus sameness or (sometimes by degree) similarity.  In technical use it is a standard form in biology, chemistry & the social sciences to indicate sameness in kind, structure, or composition and by far the most common modern use is in the now familiar “homosexual” which in many jurisdictions is now a proscribed (or at least discouraged) term because of negative associations (“homo” as a stand-alone word also having evolved as a slur used of, about or against homosexual men).

The uses of the prefix are illustrated by homogeneous (composed of parts or elements that are all of the same kind, homologous (having the same relation, relative position, or structure) & homonym (in linguistics words which sound the same or are spelled the same but have different meanings).  Iso- is used to denote equality, uniformity, or constancy in terms of specific characteristics like size, number, or configuration and is most used in scientific and mathematical publications.  Examples of use include isometric (having equal dimensions or measurements, isothermal (having constant temperature) & isosceles (having two sides of equal length).  Peri- is used to denote “surrounding or enclosing”, or “something near or around a specific area or object”, examples including perimeter (the continuous line forming the boundary of a closed geometric figure), periscope (an optical instrument for viewing objects that are above the level of direct sight, using mirrors or prisms to reflect the view & peripheral (relating to or situated on the edge or periphery of something.  So equi-focuses on equality in measure, distance, or value, homo- focuses on sameness in kind, structure, or composition, iso- focuses on equality or uniformity in specific characteristics or conditions while peri- :focuses on surrounding or enclosing, or being near or around something.  For most purposes equi- & iso- can be used interchangeably and which is used tends to be a function of tradition & convention.

Equiluminant colors

An example the equiluminant in blue & orange.  In color the text appears at the edges to "shimmer" or "vibrate".  When re-rendered in grayscale, because the value of the luminance is so close, the two shades become almost indistinguishable.

In optics, “equiluminant” is a technical term used to colors with the same (or very similar) luminance (brightness) but which differ in hue (color) or saturation (intensity).  The standard test for the quality is to convert a two-color image to grayscale and, if equiluminant, the colors would appear nearly indistinguishable because they share the same level of “lightness”.  It’s of some importance in fields as diverse as military camouflage, interior decorating, fashion, astronomy and cognitive psychology.  In the study of visual perception, when colors are equiluminant, the human visual system relies primarily on the differences in hue and saturation (rather than brightness) to distinguish between them and this can create challenges in perception; in many cases, the brain will struggle to segregate colors based solely on luminance; essentially, there is a lack of information.

An enigmatic abstraction (2024) by an unknown creator.  This is an example of the use of non-equiluminant shades of orange & blue, the original to the left, copy rendered in gray-scale to the right.

In art and design, the quality of equiluminance can be exploited to create visual effects, the perception of some “shimmering” or “vibrating” at the edges where colors meet actually a product of the way the different hues are perceived by the brain to be “less defined” (a process not dissimilar to the “grayscaling”) and thus “dynamic”, lending the impression of movement even in a static image, especially if seen with one’s peripheral vision.  While a handy device for visual artists, it can be something of some significance because the close conjunction of equiluminant colors can make certain visual tasks more difficult, most obviously reading text or distinguishing shapes and objects.  All that happens is the extent of the luminance contrast can create a perception of fuzziness at the edges of shapes which means some people can suffer a diminished ability to distinguish fine details and the smaller the object (text, numerals or geometric shape), the more acute the problem.  The phenomenon has been well researched, scientists using the properties in equiluminant colors to study how the brain processes color and the findings have been important in fields like instrumentation and the production of warning signs.

Richard Petty's 1974 NASCAR (National Association of Stock Car Auto Racing) Dodge Charger (left) and 3 ton Super-Duty Jack, produced under licence by the Northern Tool Company (right).

1974 was the last year in which the big-block engines were allowed to run in NASCAR and the big-block era (1962-1973) was NASCAR's golden age.  Richard Petty (b 1937) used a "reddish orange" to augment his traditional blue when he switched from Plymouth to Dodge as the supplier of his NASCAR stockers in the early 1970s.  His team was actually sponsored by STP rather than Gulf and STP wanted their corporate red to be used but in the end a "reddish orange" compromise was negotiated.  However, when he licenced the Northern Tool Company to sell a "Richard Petty" jack, the shade used appeared to be closer to the classic "Gulf orange".

Sexy Lamborghinis in a not quite equiluminant color combination following those of the Gulf Western racing teams: 1964 1C TL tractor (top) and 1968 1R tractor (bottom).

Lamborghini had been making tractors and other farm equipment since 1948 when first its track-drive models appeared in 1955, the 1C-TL produced between 1962-1966.  Unrelated to that model cycle, it was in 1966 Lamborghini unveiled the sensational Miura (1966-1973), powered by a transversely located, mid-mounted, 3,929 cm³ (240 cubic inch) V12 engine which sucked prodigious quantities of gas (petrol) through four triple throat downdraft Weber carburetors, each of which was needed to satiate the thirst.  The power was sent to the road via a five-speed transaxle which shared it's lubrication with the engine (shades of the BMC Mini (1959-2000) which turned out to be a bad idea and one not corrected until the final run as the Miura SV (1971-1973).  To achieve the stunning lines, mounting the V12 transversely was the only way to make things fit and the engineering was a masterpiece of packaging efficiency but it resulted in the car displaying some curious characteristics at high speed.  The specification of the 1C TL Tractor was more modest although quite appropriate for its purpose; it was powered by an air-cooled 1,462 cm³ (89 cubic inch) which delivered power to the rear portal axle and drive sprockets via a dual-range, three-speed manual transmission.  However, being a diesel, there was of course fuel-injection (by Bosch), an advance Lamborghini's V12s didn’t receive until 1985 when US emission-control regulations compelled the change.  This version of 1R tractor is known as the cofano squadrato (squared hood (bonnet)); produced between 1966-1969, it replaced the earlier 1R (1961-1965) which featured a rounded hood.  The earlier model seems not retrospectively to have been christened but presumably it would have been the cofano arrotondato (rounded hood), proving everything sounds better in Italian.  An Italian could read from a lawnmower repair manual and it would sound poetic.

As everybody knows, in Mean Girls (2004), there's an example or reference point for just about every known sociological, zoological, linguistic, political, scientific, botanical, geological or cosmological phenomenon yet observed.  Here, Lindsay Lohan in baby pink and powder blue illustrates an instance of equiluminance.

At scale, equiluminance doesn’t have to be obvious for it still to have desirable “side effects” and while it’s often noted two specific hues ((1) the blue Llewellyn Rylands pigments 3707 (Zenith Blue, replicated by Dulux as “Powder Blue”) & (2) the orange Rylands pigments 3957 (Tangerine, replicated by Dulux as “Marigold”)), that their use in combination appears so often on cars, motor-cycles and other stuff with wheels is due less to the claim the shades seem at the edge to “vibrate” that the striking combination appearing on some of the Gulf Oil sponsored Ford GT40s and Porsche 917s during sports car racing’s golden era (1950-1972).  Given the surface area involved, the effect is probably imperceptible when viewed at close range but the science does suggest that at speed (and these were fast machines), at the typical viewing range found on racetracks, there was what the optical analysts call “visual pop”, something which heightens the brain’s perception of motion.

Ford GT40 chassis# 1075, winner of the 1968 & 1969 Mans 24 hour endurance classic in Gulf racing livery.

Gulf's colors were not equiluminescent.  The company's original "corporate color scheme" had been a dark blue & orange combo but Gulf was an acquisitive conglomerate and in late 1967 it took over the Wilshire Oil Company of California, the signature colors of which were powder blue and orange, something which Gulf’s management thought “more exciting” and better suited to a racing car.  The change was made for the 1968 season with the Fords now running as five-litre (305 cubic inch) sports cars, governing body having banned the seven-litre engines the cars previously had used (under a variety of names, motorsport has for decades been governed by some of world sport’s dopiest regulatory bodies).  In the Gulf colors, fitted with 302 cubic inch (4.9 litre) engines, Ford GT40 Mark I (chassis #1075) won the Le Mans 24 hour endurance classic in 1968 & 1969 (repeating the brace Ford had achieved with the 7.0 litre (427 cubic inch) Mark II & Mark IV versions in 1966-1967), the first time the same car had achieved victory twice.  In 1968, #1075 won the BOAC International 500, the Spa 1000-kilometer race, and the Watkins Glen 6-hour endurance race, while in 1969 it also took the Sebring 12-hour race, a remarkable achievement for a race car thought obsolescent.  The livery has since been much replicated, including on many machines which have never been near a race track.

1971 Porsche 917K in Gulf Racing livery.  The fins were added to improve straight-line stability and were strikingly similar to those which appeared on some late 1950s US Chryslers although the aerodynamic properties of those were dubious, despite corporate claims.

Interestingly, the team painting the GT40s were aware of the issue created by equiluminant colors and knew that when photographed in certain conditions, the shades could tend thus.  As a matter of professional pride, they didn’t want it thought they’d created something with “fuzzy edges” so deliberately was added a dark blue hairline-border around the orange, reducing the optical illusion to ensure that when photographed, everything looked painted with precision.  When the Gulf team in 1970 switched to using Porsche 917s for the World Sports Car championship, they adopted the expedient of a black line of definition between the blue & orange so the whole enduring appeal of the combination lies just in the striking contrast and relies not at all on any tendency to the equiluminant.

Ford GT Heritage Edition First Generation (left) and Second Generation (right). 

Little more than 100 GT40s were built but Ford noted with interest the ongoing buoyancy of the replica market, as many as 2,000 thought to have been built in a number of countries (although that's dwarfed by number of replica Shelby American Cobras; it's believed there are 50-60,000-odd of them, a remarkable tribute to the 998 originals).  In the twenty-first century, the company decided to reprise the design but the new GT (2004-2006) was hardly a clone and although it shared the basic mechanical layout and the shape (though larger) was close, it was a modern machine.  The car wasn’t called GT40 because the rights to the name had ended up with another company and Ford declined to pay the demanded price.  Over 4000 were built and one special run was a tribute to the 1968-1969 cars in Gulf livery, 343 of the “Heritage Editions” produced.  A second generation of GTs was produced between 2016-2022 and was very modern, the demands of the wind-tunnel this time allowed to prevail over paying tribute to the classic lines of the 1960s.  Although the supercharged 5.4 litre V8 didn’t return and the new car used a turbocharged 3.5 litre (214 cubic inch) V6, it outperformed all its predecessors over the last 60-odd years (all the original GT40 chassis built between 1964-1969) including the 427 cubic inch monsters that won at Le Mans in 1966 & 1967 so it took decades, but eventually there really was a "replacement for displacement".  The V6 also was used also in pick-up trucks which doesn't sound encouraging but versions of the small & big block V8s used in the GT40s also saw similar service, the latter even first appearing in the doomed Edsel.  Production of the second generation was limited to 1350 units, 50 of which were “Heritage Editions” in the Gulf colors, one of several “limited editions”.

TikToker

TikToker (pronounced tik-tok-ah)

(1) One who is a regular or frequent viewer of the content posted on the short-form video (which, with mission-creep, can in certain circumstances now be up to sixty (60) minutes in duration) sharing site TikTok.com.

(2) One who is a regular or frequent content provider on the TikTok platform.

(3) With a variety of spellings (ticktocker, tictoker, tiktoka etc), a slang term for a clock or watch, derived from the alternating ticking sound, as that made by a clock (archaic).

(4) In computing, with the spelling ticktocker (or ticktocker), slang for a software element which emulates the sound of a ticking clock, used usually in conjunction with digitals depictions of analogue clocks.

2018: The ancestor form (ticktock or tick-tock) seems not to have been used until the mid-nineteenth century and was purely imitative of the sound of mechanical clocks. Tick (in the sense of "a quiet but sharp sound") was from the Middle English tek (light touch, tap) and tock was also onomatopoeic; when used in conjunction with tick was a reference to the clicking sounds similar to those made by the movements of a mechanical clock.  The use of TikToker (in the sense of relating to users (consumers & content providers) of the short-form video (which, with mission-creep, can be up to ten (10) minutes in duration) sharing site TikTok.com probably began in 2018 (the first documented reference) although it may early have been in oral use.  The –er suffix was from the Middle English –er & -ere, from the Old English -ere, from the Proto-Germanic -ārijaz, thought most likely to have been borrowed from the Latin –ārius where, as a suffix, it was used to form adjectives from nouns or numerals.  In English, the –er suffix, when added to a verb, created an agent noun: the person or thing that doing the action indicated by the root verb.   The use in English was reinforced by the synonymous but unrelated Old French –or & -eor (the Anglo-Norman variant -our), from the Latin -ātor & -tor, from the primitive Indo-European -tōr.  When appended to a noun, it created the noun denoting an occupation or describing the person whose occupation is the noun.  TikToker is a noun & adjective; the noun plural is TikTokers (the mixed upper & lower case is correct by commercial convention but not always followed).  The PRC- (People’s Republic of China) based holding company ByteDance is said to have chosen the name “TikTok” because it was something suggestive of the “short, snappy” nature of the platform’s content; they understood the target market and its alleged attention span (which, like the memory famously associated with goldfish might be misleading).

A blonde Billie Eilish, Vogue, June, 2021.

Those who use TikTok (whether as content providers or consumers) are called “tiktokers” and the longer the aggregate duration of one’s engagement with the platform, the more of a tiktoker one can be said to be.  The formation followed the earlier, self-explanatory “YouTuber” and the use for similar purposes (indicating association) for at least decades.  So, the noun tiktoker can be a neutral descriptor but it can be used also as a slur.   In February 2024, at the People’s Choice Awards ceremony held in Los Angeles, singer Billie Eilish (b 2001) was filmed leaning over to Kylie Minogue (b 1968), remarking sotto voce:“There’s some, like, TikTokers here…” with the sort of distaste Marie Antoinette (1755–1793; Queen Consort of France 1774-1792) might have displayed if indicating to her companion the unpleasing presence of peasants.  The clip went viral on X (formerly known as Twitter) before spreading to Tiktok.  Clearly there is a feeling of hierarchy in the industry and her comments triggered some discussion about the place of essentially amateur content creators at mainstream Hollywood (and such) events.  That may sound strange given a platform like TikTok would, prima facie, seem the very definition of the “people’s choice” but these events have their own history, associations and connotations and what social media sites have done to the distribution models has been quite a disturbance.  Many established players, even some who have to some extent benefited from the platforms, find disquieting the intrusion of the “plague of TikTokers”.

Pop Crave's clip of the moment, a brunette Billie Eilish & Kylie Minogue, People's Choice Awards ceremony, Los Angeles, February 2024.

There will be layers to Ms Eilish’s view.  One is explained in terms of mere proximity, the segregation of pop culture celebrities into “A List”, B List, C List” etc an important component in the creation and maintenance of one’s public image and an A Lister like her would not appreciate being photographed at an event with those well up (ie down) the alphabet sitting at the next table; it cheapens her image.  Properly managed, these images can translate into millions (and these days even billions) of dollars so this is not a matter of mere vanity and something for awards ceremonies to consider; if the TikTokers come to be seen as devaluing their brand to the extent the A Listers ignore their invitations, the events either have to move to a down-market niche or just be cancelled.  Marshall McLuhan’s (1911-1980) book Understanding Media: The Extensions of Man (1964) pre-dates social media by decades but its best-remembered phrase (“The medium is the message”) could have been coined for the era, the idea being the medium on which content is distributed should be the first point of understanding its significance, rather than actual content, the theory being the initial assessment of the veracity or the value of something relies on its source.  In the case of pop music, this meant a song distributed by a major label possessed an inherent credibility and prestige in a way something sung by a busker in a train station did not.  What the existence of YouTube and TikTok meant was the buskers and the artists signed to labels began suddenly to appear on the same medium, thus at some level gaining a sort of equivalency.  Viewing TikTok on a phone, tablet or laptop,  sharing the same screen-space, in a sense, all are rendered equal.

On trend: Lindsay Lohan announces she is now a Tiktoker.

Ms Eilish and her label have been adept at using the social media platforms as tools for this and that so presumably neither object to the existence or the technology of the sites (although her label (Universal Music) has only recently settled its dispute with TikTok over the revenue sharing) but there will be an understanding that while there’s now no alternative to, in a sense, sharing the digital space and letting the people choose, that doesn’t mean she’ll be happy about being in the same photo frame when the trophies are handed out.  Clearly, there are stars and there are TikTokers and while the latter can (and have) become the former, there are barriers not all can cross.

The Tic-Toc Tach

1967 Jaguar 340 (left), 1980 Mercedes-Benz 450 SLC 5.0 (centre) and 1970 Plymouth Superbird (right).  Only the Americans called the shared tachometer/clock a “Tic-Toc Tach”.

Since the inter-war years Jaguar had included a small clock at the bottom of the tachometer but in 1966, phasing in the change as models were updated or replaced, began to move the device to the centre of the dashboard (in the case of the 420 & 420G putting it in a blister in the padded section which had replaced the timber top-rail).  By 1968 the horological shift was almost complete (only the last of the Mark IIs (now known as 240, 340) and & Daimler V8 250 models still with the shared dial) and it was then Chrysler adopted the idea although, with a flair the British never showed, they called it the "Tic-Toc-Tachometer".  Popularly known as the “Tic-Toc Tach”, it was also used by other US manufacturers during the era, the attraction being an economical use of dash space, the clock fitting in a space at the centre of the tachometer dial which would otherwise be unused.  Mercedes-Benz picked up Jaguar's now abandoned concept in 1971 when the 350 SL (R107, 1971-1989) was introduced and it spread throughout the range, almost universal (in cars with tachometers) after 1981 when production of the 600 (W100) ended; Mercedes-Benz would for decades use the shared instrument.  A tachometer (often called a “rev counter”) is a device for measuring the revolutions per minute (RPMs) of a revolving shaft such as the crankshaft of an internal combustion engine (ICE) (thus determining the “engine speed”).  The construct was tacho- (an alternative form of tachy-, from the Ancient Greek ταχύς (takhús) (rapid) + meter (the suffix from the Ancient Greek μέτρον (métron) (measure) used to form the names of measuring devices).

1967 Oldsmobile 4-4-2.

Nobody however crammed more into a tic-toc-tach than Oldsmobile which during the first generation (1964-1967) of its 4-4-2 also included a temperature gauge, ammeter and oil pressure gauge, something necessitated because the instrument panel the stylists were compelled to use contained only two pods.  When the second generation (1968-1972) was released, the dash included a third pod so the ancillary gauges were given their own space and a true tic-toc-tach was used.  Thankfully, nobody seems ever to have attempted to coin a term for five-function device on the early 4-4-2s so those who worry about such things must content themselves with choices like “enhanced tic-toc-tach” or “augmented tic-toc-tach”.  Buyers got the instrument with its “perimeter auxiliary gauges” by choosing option code U21 (Rallye Pac with Tachometer and Clock) for US$84.26 which sounds modest but at the time the bikini-clad and neoprene-tailed “mermaids” who splashed around the coral reef in the middle of Submarine Lagoon at California’s Disneyland Resort were paid US$65 week.  Making a virtue of necessity, Oldsmobile described the cluttered device as a “compact instrument cluster [which] lets driver monitor engine performance at a glance”, not burdening brochure readers with the fact the Rallye Pac wasn’t planned as part of the range and with only two pods on the dash, there was no other way elegantly to cram it all in.

1967 Oldsmobile 4-4-2 Holiday Coupe W-30.

The 4-4-2 was Oldsmobile’s response to the Pontiac GTO, introduced in 1964 by the companion GM (General Motors) division.  The GTO (Pontiac shamelessly “borrowing” the name from Ferrari’s 250 GTO (Gran Turismo Omologato (ie car homologated for competition in the GT (grand-touring) category) was the template for the “muscle car” genre of the 1960s in that it used a big V8 from the full-sized range in the smaller, lighter, intermediate platform.  It was actually an old idea practiced on both sides of the Atlantic since the 1920s but the GTO institutionalized the concept and made it a commercial proposition on a scale never before known because of the then unique conjunction in 1960s America of a large cohort of males aged 17-25 with enough disposable income (or credit-worthiness) to pay for such things.  The GTO existed because Pontiac threaded the configuration through a loophole in the GM corporate rules designed to prevent such things being produced for road use but it sold in such volume at a pleasing profit margin that management’s scruples rapidly were discarded and the crazy years of the muscle car began.  The GTO of course encouraged imitators from Ford, Chrysler and (eventually) even AMC but it also compelled three of GM’s other divisions (Chevrolet, Buick & Oldsmobile) to do their own interpretations.  Only Cadillac stood aloof but in 1970 they did put a 500 cubic inch (8.2 litre) V8 rated at 400 HP (gross horsepower) in the FWD (front-wheel-drive) Eldorado which sounds a daft idea but the engineers disguised its inherent tendencies very well and the delivery of the 400 HP was a very different experience than something like that of the 375 Ford in the same year modestly claimed for the Boss 429 Mustang.

1970 Oldsmobile 442 Convertible, Official Pace Car (Indianapolis 500) Edition.

Though not original, GTO was of course a great name and the best Oldsmobile’s product-planners could come up with was 4-4-2, an allusion to the configuration (front to rear) of a four barrel carburetor, a four-speed manual gearbox and dual-exhausts.  Once explained it made sense but it remained a flaky name, something suffered by later imitators, Dodge’s “Super Bee” as good a car as Plymouth’s Road Runner but with nothing like the same brand-appeal.  Like Pontiac’s GTO, the 4-4-2 was originally an option package but such was the market response both became regular production models.  As it turned out, 4-4-2 was “just a name” rather than a promise because in 1965 when, in order to be advertise the things at a lower base-price, a three-speed gearbox became standard with the four-speed moved to the option list but there was no 4-3-2: 4-4-2 they all remained which made sense because at various times it could be ordered also with two or three-speed automatic gearboxes, none of which ever were dubbed 4-2-2 or 4-3-2.  However, in an inconsistency at the time not untypical in the industry, although in 1968 the badge was changed from “4-4-2” to “442”, both descriptions continued for years to appear in documents and sales literature.

1953 Kaiser Manhattan (left) and 1961 Chrysler 300G (left).

Although no other manufacturer put five separate functions in the one circular pod, others did do five-function clusters in a more elaborate housing but while Kaiser just appended a semi-circular surround for the ancillary gauges (fuel-level, coolant temperature, ammeter & oil pressure) Chrysler in 1960 introduced the “Astrodome”, the name one of many influenced by what was going on during the dawn of the space-age.  What the dramatic Astrodome did was offer the driver a “3D” effect by placing the four gauges in a staggered array on the steering column, using space usually taken by the transmission selector lever, that function moved to a push-button panel on the dashboard while the turn-signals were controled by a sliding lever; to complete the “space-race” look, buttons and knobs were prolific so although the ergonomics weren’t ideal, visually, the atmospherics were most fetching.

1961 Chrysler 300G.

The speedometer was calibrated to 150 mph (240 km/h) which was needed because, even in street trim, the most highly-tuned 300Gs easily could exceed 140 mph (225 km/h).  Despite the concerns sometimes expressed today, the tires of the era were safe to use at such speed (much had been learned from the tyres developed for use in aviation during World War II (1939-1945)) but the drum brakes of the era were inadequate.

Adding to the drama in 1960 was what Chrysler called “revolutionary Panelescent lighting” which was a fanciful term describing the use of electroluminescence (EL), an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field.  As implemented for the Panelescent system, as well as the soft blue backlighting, each gauge pointer was also an individual source of red light.  The Astrodome was used between 1960-1962 on a number of Chryslers including the “Letter-series” 300s and the New Yorker while EL remained in use until 1967; it was last seen on the first generation Dodge Charger (1966-1967).

Conventions in English and Ablaut Reduplication

In 2016, the BBC explained why we always say “tick tock” rather than “tock-tic” although, based on the ticking of the clocks at the time the phrase originated, there would seem to be no objective reasons why one would prevail over the other but the “rule” can be constructed thus: “If there are three words then the order has to go I, A, O.  If there are two words then the first is I and the second is either A or O which is why we enjoy mish-mash, chit-chat, clip-clop, dilly-dally, shilly-shally, tip-top, hip-hop, flip-flop, tic tac, sing song, ding dong, King Kong & ping pong.  Obviously, the “rule” is unwritten so may be better thought a convention such as the one which dictates why the words in “Little Red Riding Hood” appear in the familiar order; there the convention specifies that in English, adjectives run in the textual string: opinion; size; age; shape; colour; origin; material; purpose noun.  Thus there are “little green men” but no “green little men” and if “big bad wolf” is cited as a violation of the required “opinion (bad); size (big); noun (wolf)” wolf, that’s because the I-A-O convention prevails, something the BBC explains with a number of examples, concluding “Maybe the I, A, O sequence just sounds more pleasing to the ear.”, a significant factor in the evolution of much that is modern English (although that hardly accounts for the enduring affection some have for proscribing the split infinitive, something which really has no rational basis in English, ancient or modern.  All this is drawn from what is in structural linguistics called “Ablaut Reduplication” (the first vowel is almost always a high vowel and the reduplicated vowel is a low vowel) but, being English, “there are exceptions” so the pragmatic “more pleasing to the ear” may be helpful in general conversation.

Rolls-Royce, the Ford LTD and NVH

Rolls-Royce Silver Cloud II, 1959.  Interestingly, the superseded Silver Cloud (1955-1958) might have been quieter still because the new, aluminium 6¼ litre (380 cubic inch) V8 didn’t match the smoothness & silence of the previous cast iron, 4.9 litre (300 cubic inch) straight-six, despite the V8 being remarkably heavy for something made substantially from "light metal".

The “tick-tocking” sound of a clock was for some years a feature of the advertising campaigns of the Rolls-Royce Motor Company, the hook being that: “At 60 mph (100 km/h) the loudest noise in a Rolls-Royce comes from the electric clock”.  Motoring journalists did verify the claim (at least in ideal conditions) but given electric clocks can be engineered silently to function, the conclusion was the company deliberately fitted time-pieces which emitted an untypically loud “tick-tock”, just to ensure the claims were true.  The Silver Clouds were, by the standards of the time, very quiet vehicles but in the US, Ford decided they could mass-produce something quieter still and at the fraction of the cost.  Thus the 1965 Ford LTD, a blinged-up Ford (the add-on "gingerbread" in pre-bling days known as "gorp") advertised as: “Quieter than a Rolls-Royce”.

The test conditions were recorded as: “Dry, level, moderately smooth concrete divided highway; light quartering winds.  All cars operated at steady 20-, 40- and 60- mph with all vents closed”.  The two Rolls-Royces were both standard wheelbase Silver Cloud III saloons with the 6¼ litre (380 cubic inch) V8 and four-speed automatic transmissions while the three Fords (a Galaxie 500 LTD, a Galaxie 500/XL and a Galaxie 500 Four-Door Sedan) were all fitted with the 289 cubic inch (4.7 litre) V8 and three-speed Cruise-O-Matic automatic transmission.  The test results were certified by the USAC (United States Auto Club).

To ensure what must at the time have seemed an audacious claim couldn't be dismissed as mere puffery, J. Walter Thompson, then Ford’s advertising agency commissioned acoustical consultants Boldt, Beranek and Neuman to run tests, two brand new Rolls-Royce Silver Cloud III saloons purchased for the project.  What the engineer’s decibel (dB) meters revealed was that, under conditions that were controlled but representative of much of the driving experience in the US, the Galaxies were indeed quieter inside than a Rolls-Royce.  Because of the way the dB scale works, the differences (as great as 5.5 dB) were quite large and obvious to the human ear.  It was a reasonable achievement in engineering and Ford, anticipating the ensuing controversy, was uncharacteristically modest in claiming their 2.8 dB advantage at 60 mph was only “slight”, the numbers making the point with no need for exaggeration.  Ford didn’t mention the tick-tock of the clock.

Ford Galaxie 500/XL advertising, 1965.  In the West, advertising has long been an exception to the general prohibition of the use of "child labor" (Lindsay Lohan was signed to Ford Models at the age of three and soon got her first gig!).

Ford did though “stack the deck”, a bit in configuring the Galaxies with their mildly tuned 289 V8 with a two-barrel carburettor; had the test included another variation on the full-size line which used the 427 (7.0) V8, the results would have been different, the raucous 427 side oiler offering many charms but they didn't extend to unobtrusiveness.  Still, the choice was reasonable because the tune of the 289 was more representative of what most people bought.  Amusingly, it wasn't the first time Rolls-Royce was surprised by the way things were done in Detroit.  Years earlier, the company had obtained a licence to manufacture Cadillac's four-speed Hydramatic automatic transmission, then the benchmark of its type.  Disassembling one, the Rolls-Royce engineers were surprised at the “rough finish” on some of the internal components and resolved their version would be built to their standards of precision.  That done, a lovingly built Hydramatic was installed in a car and tested, the engineers surprised to find it didn't work very well and offered nothing like the smooth operation of the original.  They contacted Cadillac and were told the prototype Hydramatics produced with universally fine tolerances had also misbehaved and the “roughness” of certain components deliberately was introduced to ensure the optimal frictional resistance was obtained.     

Ford Galaxie 500 LTD advertising, 1965.

Not much noticed at the time was another intrusion.  Although the trend had for years been creeping through the industry, what the 1965 LTD did was make blatant Ford's incursion into the market territory once reserved for the corporate stablemate, Mercury, the "middle class" brand between Ford & Lincoln.  This intra-corporate cannibalism (which had already seen Chrysler shutter its DeSoto division) would have consequences, one of which was Mercury's eventual demise, another being Ford's competitors, noting the LTD's success, bringing their own interpretations to the market, the most successful of which was the Chevrolet Caprice (which enjoyed the same relationship to the Impala as the LTD had to the Galaxie 500).  Notably, the Caprice contributed to the later extinction of the once highly popular Oldsmobile, squeezed from its niche by Chevrolet (from below) and Buick (from above).  What were once gaps in the market, catered to by specific brands, ceased to exist. 

1965 Ford LTD (technically a “Galaxie 500 LTD” because in the first season the LTD was a Galaxie option, not becoming a stand-alone model until the 1966 model year).

Even before the LTD was released the full-sized cars produced by the US industry featured the world's finest engine-transmission combinations and Ford justly deserves credit for what was achieved in 1965 because it wasn’t an exercise merely in adding sound insulation.  The previous models had a good reputation for handling and durability but couldn’t match the smoothness and ride of competitive Chevrolets so within Ford was created a department dedicated to what came to be called HVH (Noise, Vibration & Harshness) and this team cooperated in what would now be understood as a “multi-disciplinary” effort, working with body engineers and suspension designers to ensure all components worked in harmony to minimize NVH.  The idea was to craft a platform which, at least on the billiard table like surfaces of the nations freeways, would match the powertrains for smoothness and that was a task which would absorb much time and effort because the mildly-tuned V8 engines most customers bough were unobtrusive in their delivery and the automatic transmissions didn't so much change gears as slur effortlessly between ratios.

Ford Galaxie 500 LTD (with "Body/Chassis Puck") advertising with , 1965.

What emerged was a BoF (Body on Frame) platform (a surprise to some as the industry trend had been towards unitary construction) to ensure the stiffest possible structure but the combination of the frame’s rubber body-mounts (which Ford dubbed "pucks" because of their similarity in size and shape to the rubber disks used in ice hockey), robust torque boxes and a new, more compliant, coil-spring rear suspension delivered what even the competition's engineers (though probably not the sales staff) acknowledged was the industry’s quietest, smoothest ride.  To solve the problem of troublesome vibrations, the material had before come to the rescue, a rubber layer for the carburettor mountings proving the solution to the resonance which, at certain road speeds, affected the flow of the fuel-air mix in the MGA Twin-Cam, resulting in pistons melting.  Alas, the fix was discovered too late and the MGA was doomed.  Norton had better luck with their Isolastic, a rubber-based engine mounting which disguised the chronic vibration on the Commando's 750 cm³ parallel twin, allowing the company (as something of a last gasp) to extract a (sometimes profitable) decade from what was an antiquated design.

Ford LTD advertising, 1980.

In geopolitics and economics, much changed between 1965 and 1980.  Whereas Ford had once been able prove their Galaxie range (US$2,800-4,800) was quieter than a US$17,000 Rolls-Royce, by 1980 a LTD (the Galaxie name, dating from 1959 was retired after the 1974 season) sold typically for between US$6,400-8,000, reflecting the inflation which became entrenched during the 1970s.  That was representative of the effect on domestically produced cars but an "entry-level" (the concept really was used even of cars from the more exulted) Rolls-Royce Silver Shadow now listed for a minimum US65,000-odd and if that wasn't thought conspicuous enough consumption, there was the two-door Camargue with a price tag in six figures.  The LTD was looking even better value.  Ford in the era made a bit of a thing of comparing their locally produced machines with high-priced stuff from across the Atlantic, one campaign showing how closely the US Granada (1975-1982) resembled various Mercedes-Benz; these days it's the Chinese manufacturers which are accused of plagiarism although they often are more blatant in their copying.  Reckoning however what worked in 1965 would still work 15 years on, Ford re-ran their tests and, in a regulatory environment which was rather more harsh on advertising claims, asserted only that "The 1980 Ford LTD rides as quietly as a $65,000 Rolls-Royce".  The tic-tock of the clock still didn't rate a mention.        

Demand

Demand (pronounced dih-mand (U) or dee–mahnd (non-U))

(1) To ask for with proper authority; claim as a right.

(2) To ask for peremptorily or urgently.

(3) To call for or require as just, proper, or necessary.

(4) In law, to lay formal claim to.

(5) In law, to summon, as to court.

(6) An urgent or pressing requirement.

(7) In economics, the desire to purchase, coupled (hopefully) with the power to do so.

(8) In economics, the quantity of goods that buyers will take at a particular price.

(9) A requisition; a legal claim.

(10) A question or inquiry (archaic).

1250-1300: From Middle English demaunden and Anglo-French demaunder, derived from the Medieval Latin dēmandāre (to demand, later to entrust) equivalent to dē + mandāre (to commission, order).  The Old French was demander and, like the English, meant “to request” whereas "to ask for as a right" emerged in the early fifteenth century from Anglo-French legal use.  As used in economic theory and political economy (correlating to supply), first attested from 1776 in the writings of Adam Smith.  The word demand as used by economists is a neutral term which references only the conjunction of (1) a consumer's desire to purchase goods or services and (2) hopefully the power to do so.  However, in general use, to say that someone is "demanding" something does carry a connotation of anger, aggression or impatience.  For this reason, during the 1970s, the language of those advocating the rights of women to secure safe, lawful abortion services changed from "abortion on demand" (ie the word used as an economist might) to "pro choice".  Technical fields (notably economics) coin derived forms as they're required (counterdemand, overdemand, predemand etc).  Demand is a noun & verb, demanding is a verb & adjective, demandable is an adjective, demanded is a verb and demander is a noun; the noun plural is demands.

Video on Demand (VoD)

Directed by Tiago Mesquita with a screenplay by Mark Morgan, Among the Shadows is a thriller which straddles the genres, elements of horror and the supernatural spliced in as required.  Although in production since 2015, with the shooting in London and Rome not completed until the next year, it wasn’t until 2018 when, at the European Film Market, held in conjunction with the Internationale Filmfestspiele Berli (Berlin International Film Festival), that Tombstone Distribution listed it, the distribution rights acquired by VMI, Momentum and Entertainment One, and VMI Worldwide.  In 2019, it was released progressively on DVD and video on demand (VoD), firstly in European markets, the UK release delayed until mid-2020.  In some markets, for reasons unknown, it was released with the title The Shadow Within.

Video on Demand (VoD) and streaming services are similar concepts in video content distribution but there are differences.  VoD is a system which permits users to view content at any time, these days mostly through a device connected to the internet across IP (Internet Protocol), the selection made from a catalog or library of available titles and despite some occasionally ambiguous messaging in the advertising, the content is held on centralized servers and users can choose directly to stream or download.  The VoD services is now often a sub-set of what a platform offers which includes content which may be rented, purchased or accessed through a subscription.

Streaming is a method of delivering media content in a continuous flow over IP and is very much the product of the fast connections of the twenty-first century.  Packets are transmitted in real-time which enables users to start watching or listening without waiting for an entire file (or file set) to download, the attraction actually being it obviates the need for local storage.  There’s obviously definitional and functional overlap and while VoD can involve streaming, not all streaming services are technically VoD and streaming can also be used for live events, real-time broadcasts, or continuous playback of media without specific on-demand access. By contrast, the core purpose of VoD is to provide access at any time and streaming is a delivery mechanism, VoD a broad concept and streaming a specific method of real-time delivery as suited to live events as stored content.

The Mercedes-Benz SSKL and the Demand Supercharger

Modern rendition of Mercedes-Benz SSLK in schematic, illustrating the drilled-out chassis rails.  The title is misleading because the four or five SSKLs built were all commissioned in 1931 (although it's possible one or more used a modified chassis which had been constructed in 1929).  All SSK chassis were built between 1928-1932 although the model remained in the factory's catalogue until 1933. 

The Mercedes-Benz SSKL was one of the last of the road cars which could win top-line grand prix races.  An evolution of the earlier S, SS and SSK, the SSKL (Super Sports Kurz (short) Leicht (light)) was notable for the extensive drilling of its chassis frame to the point where it was compared to Swiss cheese; reducing weight with no loss of strength.  The SSKs and SSKLs were famous also for the banshee howl from the engine when the supercharger was running; nothing like it would be heard until the wail of the BRM V16s twenty years later.  It was called a demand supercharger because, unlike some constantly-engaged forms of forced-induction, it ran only on-demand, in the upper gears, high in the rev-range, when the throttle was pushed wide-open.  Although it could safely be used for barely a minute at a time, when running, engine power jumped from 240-odd horsepower (HP) to over 300.  The number of SSKLs built has been debated and the factory's records are incomplete because (1) like many competition departments, it produced and modified machines "as required" and wasn't much concerned about documenting the changes and (2) many archives were lost as a result of bomb damage during World War II (1939-1945); most historians suggest there were four or five SSKLs, all completed (or modified from earlier builds) in 1931.  The SSK had enjoyed great success in competition but even in its heyday was in some ways antiquated and although powerful, was very heavy, thus the expedient of the chassis-drilling intended to make it competitive for another season.  Lighter (which didn't solve but at least to a degree ameliorated the brake & tyre wear) and easier to handle than the SSK (although the higher speed brought its own problems, notably in braking), the SSKL enjoyed a long Indian summer and even on tighter circuits where its bulk meant it could be out-manoeuvred, sometimes it still prevailed by virtue of durability and sheer power.

Rudolf Caracciola (1901–1959) and SSKL in the wet, German Grand Prix, Nürburgring, 19 July, 1931.  Alfred Neubauer (1891–1980; racing manager of the Mercedes-Benz competition department 1926-1955) maintained Caracciola "...never really learned to drive but just felt it, the talent coming to him instinctively."    

Sometimes too it got lucky.  When the field assembled in 1931 for the Fünfter Großer Preis von Deutschland (fifth German Grand Prix) at the Nürburgring, even the factory acknowledged that at 1600 kg (3525 lb), the SSKLs, whatever their advantage in horsepower, stood little chance against the nimble Italian and French machines which weighed-in at some 200 KG (440 lb) less.  However, on the day there was heavy rain with most of race conducted on a soaked track and the twitchy Alfa Romeos, Maseratis and the especially skittery Bugattis proved less suited to the slippery surface than the truck-like but stable SSKL, the lead built up in the rain enough to secure victory even though the margin narrowed as the surface dried and a visible racing-line emerged.  Time and the competition had definitely caught up by 1932 however and it was no longer possible further to lighten the chassis or increase power so aerodynamics specialist Baron Reinhard von Koenig-Fachsenfeld (1899-1992) was called upon to design a streamlined body, the lines influenced both by his World War I (1914-1918 and then usually called the "World War") aeronautical experience and the "streamlined" racing cars which had been seen in the previous decade.  At the time, the country greatly was affected by economic depression which spread around the world after the 1929 Wall Street crash, compelling Mercedes-Benz to suspend the operations of its competitions department so the one-off "streamliner" was a private effort (though with some tacit factory assistance) financed by the driver (who borrowed some of the money from his mechanic!).

The streamlined SSKL crosses the finish line, Avus, 1932.

The driver was Manfred von Brauchitsch (1905-2003), nephew of Major General (later Generalfeldmarschall (Field Marshal)) Walther von Brauchitsch (1881–1948; Oberbefehlshaber (Commander-in-Chief) of OKH (Oberkommando des Heeres (the German army's high command) 1938-1941).  An imposing but ineffectual head of the army, Uncle Walther also borrowed money although rather more than loaned by his nephew's mechanic, the field marshal's funds coming from the state exchequer, "advanced" to him by Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945).  Quickly Hitler learned the easy way of keeping his mostly aristocratic generals compliant was to loan them money, give them promotions, adorn them with medals and grant them estates in the lands he'd stolen during his many invasions.  His "loans" proved good investments.  Beyond his exploits on the circuits, Manfred von Brauchitsch's other footnote in the history of the Third Reich (1933-1945) is the letter sent on April Fools' Day 1936 to Uncle Walther (apparently as a courtesy between gentlemen) by Baldur von Schirach (1907-1974; head of the Hitlerjugend (Hitler Youth) 1931-1940 & Gauleiter (district party leader) and Reichsstatthalter (Governor) of Vienna 1940-1945) claiming he given a "horse whipping" to the general's nephew because a remark the racing driver was alleged to have made about Frau von Schirach (the daughter of Hitler's court photographer!).  It does seem von Schirach did just that though it wasn't quite the honorable combat he'd claimed: in the usual Nazi manner he'd arrived at von Brauchitsch's apartment in the company of several thugs and, thus assisted, swung his leather whip.  Von Brauchitsch denied ever making the remarks.  Unlike the German treasury, the mechanic got his money back and that loan proved a good investment, coaxing from the SSKL a victory in its final fling.  Crafted in aluminum by Vetter in Cannstatt, the body was mounted on von Brauchitsch's race-car and proved its worth at the at the Avusrennen (Avus race) in May 1932; with drag reduced by a quarter, the top speed increased by some 12 mph (20 km/h) and the SSKL won its last major trophy on the unique circuit which rewarded straight-line speed like no other.  It was the last of the breed; subsequent grand prix cars would be pure racing machines with none of the compromises demanded for road-use.

Evolution of the front-engined Mercedes-Benz grand prix car, 1928-1954

1928 Mercedes-Benz SS.

As road cars, the Mercedes-Benz W06  S (1927-1928) & SS (1928-1930) borrowed unchanged what had long been the the standard German approach in many fields (foreign policy, military strategy, diplomacy, philosophy etc): robust engineering and brute force; sometimes this combination worked well, sometimes not.  Eschewing refinements in chassis engineering or body construction as practiced by the Italians or French, what the S & SS did was achieved mostly with power and the reliability for which German machinery was already renowned.  Although in tighter conditions often out-manoeuvred, on the faster circuits both were competitive and the toughness of their construction meant, especially on the rough surfaces then found on many road courses, they would outlast the nimble but fragile opposition.

1929 Mercedes-Benz SSK.

By the late 1920s it was obvious an easier path to higher performance than increasing power was to reduce the SS's (Super Sport) size and weight.  The former easily was achieved by reducing the wheelbase, creating a two-seat sports car still suitable for road and track, tighter dimensions and less bulk also reducing fuel consumption and tyre wear, both of which had plagued the big, supercharged cars.  Some engine tuning and the use of lighter body components achieved the objectives and the SSK was in its era a trophy winner in sports car events and on the grand prix circuits.  Confusingly, the "K" element in the name stood for kurz (short) and not kompressor (supercharger) as was applied to some other models although all SSKs used a supercharged, 7.1 litre (433 cubic inch) straight-six. 

1931 Mercedes-Benz SSKL.

The French, British and Italian competition however also were improving their machinery and by late 1930, on the racetracks,  the SSK was becoming something of a relic although it remained most desirable as a road car, demand quelled only by a very high price in what suddenly was a challenging economic climate.  Without the funds to create anything new and with the big engine having reached the end of its development potential, physics made obvious to the engineers more speed could be attained only through a reduction in mass so not only were body components removed or lightened where possible but the chassis and sub-frames were drilled to the point where the whole apparatus was said to resemble "a Swiss cheese".  The process was time consuming but effective because, cutting the SSK's 1600 KG heft to the SSKL's more svelte 1445 (3185), combined with the 300-odd HP which could be enjoyed for about a minute with the supercharger engaged, produced a Grand Prix winner which was competitive for a season longer than any had expected and one also took victory in the 1931 Mille Miglia.  Although it appeared in the press as early a 1932, the "SSKL" designation is retrospective, the factory's extant records listing the machines either as "SSK" or "SSK, model 1931".  No more than five were built and none survive (rumors of a frame "somewhere in Argentina" apparently an urban myth) although some SSK's were at various times "drilled out" to emulate the look and the appeal remains, a replica cobbled together from real and fabricated parts sold at auction in 2007 for over US$2 million; this was when a million dollars was still a lot of money.  

1932 Mercedes-Benz SSKL (die Gurke).

The one-off bodywork (hand beaten from aircraft-grade sheet aluminum) was fabricated for a race held at Berlin's unique Automobil-Verkehrs- und Übungsstraße (Avus; the "Automobile traffic and training road") which featured two straights each some 6 miles (10 km) in length, thus the interest in increasing top speed and while never given an official designation by the factory, the crowds dubbed it die Gurke (the cucumber).  The streamlined SSKL won the race and was the first Mercedes-Benz grand prix car to be called a Silberpfeil (silver arrow), the name coined by radio commentator Paul Laven (1902-1979) who was broadcasting trackside for Südwestdeutsche Rundfunkdienst AG (Southwest German Broadcasting Service); he was struck by the unusual appearance although the designer had been inspired by an aircraft fuselage rather than arrows or the vegetable of popular imagination.  The moniker was more flattering than the nickname Weiße Elefanten (white elephant) applied to S & SS which was a reference to their bulk and not a use of the phrase in its usual figurative sense.  The figurative sense came from the Kingdom of Siam (modern-day Thailand) where elephants were beasts of burden, put to work hauling logs in forests or carting other heavy roads but the rare white (albino) elephant was a sacred animal which could not be put to work.  However, the owner was compelled to feed and care for the unproductive creature and the upkeep of an elephant was not cheap; they have large appetites.  According to legend, if some courtier displeased the king, he could expect the present of a white elephant.  A “white elephant” is thus an unwanted possession that though a financial burden, one is “stuck with” and the term is applied the many expensive projects governments around the world seem unable to resist commissioning.

Avus circuit.  Unique in the world, it was the two long straights which determined die Gurke's emphasis on top speed.  Even the gearing was raised (ie a numerically lower differential ratio) because lower engine speeds were valued more than low-speed acceleration which was needed only once a lap.

The size of the S & SS was exaggerated by the unrelieved expanses of white paint (Germany's designated racing color) although despite what is sometimes claimed, Ettore Bugatti’s (1881–1947) famous quip “fastest trucks in the world” was his back-handed compliment not to the German cars but to W. O. Bentley’s (1888–1971) eponymous racers which he judged brutish compared to his svelte machines.  Die Gurke ended up silver only because such had been the rush to complete the build in time for the race, there was time to apply the white paint so it raced in a raw aluminum skin.  Remarkably, in full-race configuration, die Gurke was driven to Avus on public roads, a practice which in many places was tolerated as late as the 1960s.  Its job at Avus done, die Gurke was re-purposed for high-speed tyre testing (its attributes (robust, heavy and fast) ideal for the purpose) before "disappearing" during World War II.  Whether it was broken up for parts or metal re-cycling, spirted away somewhere or destroyed in a bombing raid, nobody knows although it's not impossible conventional bodywork at some point replaced the streamlined panels.  In 2019, Mercedes-Benz unveiled what it described as an "exact replica" of die Gurke, built on an original (1931) chassis.    

1934 Mercedes-Benz W25.

After building the replica Gurke, Mercedes-Benz for the first time subjected it to a wind-tunnel test, finding (broadly in line with expectations) its c_d (coefficient of drag) improved by about a third, recording 0.616 against a standard SSK's 0.914.  By comparison, the purpose-built W25 from 1934 delivered a 0.614 showing how effective Baron Koenig-Fachsenfeld's design had been although by today's standards, the numbers are not of shapes truly "slippery".  Although "pure" racing cars had for years existed, the W25 (Werknummer (works number) 25) was the one which set many elements is what would for a quarter-century in competition be the default template for most grand prix cars and its basic shape and configuration remains recognizable in the last front-engined car to win a Word Championship grand prix in 1960.  The W25 was made possible by generous funding from the new Nazi Party, "prestige projects" always of interest to the propaganda-minded party.  With budgets which dwarfed the competition, immediately the Mercedes-Benz and Auto Unions enjoyed success and the W25 won the newly inaugurated 1935 European Championship.  Ironically, the W25's most famous race was the 1935 German Grand Prix at the Nürburgring, won by the inspired Italian Tazio Nuvolari (1892–1953) in an out-dated and under-powered Alfa-Romeo P3, von Brauchitsch's powerful W25 shredding a rear tyre on the final lap.  However, the Auto Union's chassis design fundamentally was more farsighted; outstanding though the engine was, the W25's platform was, in many ways, eine bessere Gurke (a better cucumber) and because its limitations were inherent, the factory "sat out" most of the 1936 season to develop the W125.

1937 Mercedes-Benz W125.

Along with the dramatic, mid-engined,  V16 Auto Union Type C, the W125 was the most charismatic race car of the "golden age" of 1930s European circuit racing.  When tuned for use on the fastest circuits, the 5.7 litre (346 cubic inch) straight-eight generated over 640 HP and in grand prix racing that number would not be exceeded until the turbocharged engines (first seen in 1977) of the 1980s.  The W125 used a developed version of the W25's 3.4 (205) & 4.3 (262) straight-eights and the factory had assumed this soon would be out-performed by Auto Union's V16s but so successful did the big-bore eight prove the the Mercedes-Benz V16 project was aborted, meaning resources didn't need to be devoted to the body and chassis engineering which would have been required to accommodate the bigger, wider and heavier unit (something which is subsequent decades would doom a Maserati V12 and Porsche's Flat-16.  The W125 was the classic machine of the pre-war "big horsepower" era and if a car travelling at 100 mph (160 km/h) passed a W125 at standstill, the latter could accelerate and pass that car within a mile (1.6 km).

A W125 on the banked Nordschleife (northern ribbon (curve)) at Avus, 1937.  At Avus, the streamlined bodywork was fitted because a track which is 20 km (12 miles) in length but has only four curves puts an untypical premium on top-speed.  The banked turn was demolished in 1967 because increased traffic volumes meant an intersection was needed under the Funkturm (radio tower), tower and today only fragments of the original circuit remain although the lovely art deco race control tower still exists and was for a time used as restaurant.  Atop now sits a Mercedes-Benz three-pointed star rather than the swastika which flew in 1937. 

1938 Mercedes-Benz W154.

On the fastest circuits the streamlined versions of the W125s were geared to attain 330 km/h (205 mph) and 306 km/h (190 mph) often was attained in racing trim.  With streamlined bodywork, there was also the Rekordwagen built for straight-line speed record attempts and one set a mark of 432.7 km/h (268.9 mph), a public-road world speed record that stood until 2017.  Noting the speeds and aware the cars were already too fast for circuits which had been designed for, at most, velocities sometimes 100 km/h (50 mph) less, the governing body changed the rules, limiting the displacement for supercharged machines to 3.0 litres (183 cubic inch), imagining that would slow the pace.  Fast though the rule-makers were, the engineers were quicker still and it wasn't long before the V12 W154 was posting lap-times on a par with the W125 although they did knock a few km/h off the top speeds.  The rule change proved as ineffective in limiting speed as the earlier 750 KG formula which had spawned the W25 & W125.

1939 Mercedes-Benz W165.

An exquisite one-off, the factory built three W165s for the single purpose of contesting the 1939 Tripoli Grand Prix.  Remarkable as it may now sound, there used to be grand prix events in Libya, then a part of Italy's colonial empire.  Anguished at having for years watched the once dominant Alfa Romeos enjoy only the odd (though famous) victory as the German steamroller flattened all competition (something of a harbinger of the Wehrmacht's military successes in 1939-1940), the Italian authorities waited until the last moment before publishing the event's rules, stipulating the use of a voiturette (small car) with a maximum displacement of 1.5 litres  (92 cubic inch).  The rules were designed to suit the Alfa Romeo 158 (Alfetta) and Rome was confident the Germans would have no time to assemble such a machine.  However, knowing Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945), still resenting what happened at the Nürburgring in 1935, would not be best pleased were his Axis partner (and vassal) Benito Mussolini (1883-1945; Duce (leader) & Prime-Minister of Italy 1922-1943) to enjoy even this small victory, the factory scrambled and conjured up the V8-powered (a first for Mercedes-Benz) W165, the trio delivering a "trademark 1-2-3" finish in Tripoli.  As a consolation, with Mercedes-Benz busy building inverted V12s for the Luftwaffe's Messerschmitts, Heinkels and such, an Alfa Romeo won the 1940 Tripoli Grand Prix which would prove the city's last.      

 

1954 Mercedes Benz W196R Strómlinienwagen (literally "streamlined car" but translated usually as "Streamliner".

A curious mix of old (drum brakes, straight-eight engine and swing axles) and new (a desmodromic valve train, fuel injection and aerodynamics developed in a wind-tunnel with the help of engineers then banned from being involved in aviation), the intricacies beneath the skin variously bemused or delighted those who later would come to be called nerds but it was the sensuous curves which attracted most publicity.  Strange though it appeared, it was within the rules and clearly helped deliver stunning speed although the pace did expose some early frailty in road-holding (engineers have since concluded the thing was a generation ahead of tyre technology).  It was one of the prettiest grand prix cars of the post war years and the shape (sometimes called "type Monza", a reference to the Italian circuit with long straights so suited to it) would later much appeal to pop-artist Andy Warhol (1928–1987) who used it in a number of prints.

1954 Mercedes-Benz W196R.  In an indication of how progress accelerated after 1960, compare this W196R with (1) the W25 of 20 years earlier and (2) any grand prix car from 1974, 20 years later. 

However, although pleasing to the eye, the W196R Strómlinienwagen was challenging even for expert drivers and it really was a machine which deserved a de Dion rear suspension rather than the swing axles (on road cars the factory was still building a handful with these as late as 1981 and their fudge of semi-trailing rear arms (the "swing axle when you're not having a swing axle") lasted even longer).  Of more immediate concern to the drivers than any sudden transition to oversteer was that the aluminium skin meant they couldn't see the front wheels so, from their location in the cockpit, it was difficult to judge the position of the extremities, vital in a sport where margins can be fractions of a inch.  After the cars in 1954 returned to Stuttgart having clouted empty oil drums (those and bails of hay was how circuity safety was then done) during an unsuccessful outing to the British Grand Prix at Silverstone, a conventional body quickly was crafted and although visually unremarkable, the drivers found it easier to manage and henceforth, the Strómlinienwagen appeared only at Monza.  There was in 1954-1955 no constructor's championship but had there been the W196R would in both years have won and it delivered two successive world driver's championships for Juan Manuel Fangio (1911–1995).  Because of rule changes, the three victories by the W196R Strómlinienwagen remain the only ones in the Formula One World Championship (since 1950) by a car with enveloping bodywork.