Delta

Delta (pronounced del-tuh)

(1) The fourth letter of the Modern Greek alphabet (Δ, δ).

(2) The consonant sound represented by this letter.

(3) The fourth in a series of items.

(4) Anything triangular, an allusion to the Greek capital delta (Δ).

(5) In mathematics, an incremental change in a variable, as Δ or δ.

(6) A nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular.

(7) A word used in communications to represent the letter D (usually initial capital letter); Used in the ICAO (International Civil Aviation Organization) radiotelephony spelling alphabet (usually known as the NATO phonetic alphabet).

(8) In astronomy, a star that is usually the fourth brightest of a constellation (initial capital letter).

(9) In computing, a small but noticeable effect or the set of differences between two versions of a file; in informal use, a small but noticeable effect.

(10) In surveying, the angle subtended at the centre of a circular arc.

(11) A type of cargo bike that has one wheel in front and two in back.

(12) In electrical engineering (often attributive), the closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.

(13) In finance, the rate of change in an option value with respect to the underlying asset's price.

(14) In chemistry, a value in delta notation indicating the relative abundances of isotopes or relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.

(15) In aerodynamics, a type of wing.

(16) The NATO code name for a class of Soviet nuclear-powered ballistic missile submarine armed with sixteen multi-warhead missiles.

(17) In physics, of or characterizing the atom or radical group that is fourth in position from the functional group of atoms in an organic molecule.

(18) In US Space Force use, a unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.

(19)   In electrical engineering, the closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.

Circa 1200: From the Middle English deltha from the Latin delta from the Ancient Greek δέλτα (délta), from the Phoenician dalet & daleth (tent door).  It was akin to the Hebrew dāleth.  It was the fourth letter of the Greek alphabet (equivalent to the Modern English D) and was shaped like a triangle (Δ).  The sense of a delta being a "triangular island or alluvial tract between the diverging branches of the mouth of a great river" is because the Ancient Greek writer Herodotus (circa 484–circa 425 BC) used it to describe the mouth of the Nile River (now known as the Nile Delta).  That was picked up in English during the 1550s and applied to other river mouths (often of quite different shapes) by 1790.  The related forms are deltaic and deltification.  In pre-modern medicine, the deltoid muscle (the large muscle of the shoulder; triangular, resembling the Greek letter delta) was described in 1758, the name from the Ancient Greek deltoeides (triangular, literally "shaped like the letter delta).  In modern use, the "deltoid muscle" gained the short-form “delts” in 1977.  The related form is deltoidal.

The delta-wing

Gloster Javelin (1951-1967).  The first twin-engined delta-wing in service, the Javelin was the UK’s long-term solution to its need for an all-weather interceptor, the post-war technology gap until then filled by the stop-gap Gloster Meteor and that most improbable cold-war fighter, the de Havilland Mosquito.  The Javelin was the last aircraft to bear the Gloster name, the company absorbed into the morass created by the mergers, acquisitions and nationalization that befell British industry between Attlee and Thatcher. 

In aviation, the delta shape pre-dated aircraft by centuries, triangular stabilizing fins for rockets described in the sixteenth and seventeenth centuries and the first lifting wing in delta form patented in 1867 for use by a dart-shaped, rocket-propelled airplane.  However, although there were prototypes and much theoretical work was done during the first half of the twentieth century, it wasn’t until the late-1940s when jet propulsion made possible high-speed subsonic and supersonic flight that it was possible to build airframes which could take advantages of the delta-wing’s unique properties.

Lockheed SR-71 Blackbird (1963-1999).  A product of Lockheed’s Skunk Works, although in development as a high-altitude interceptor since 1959, the US government didn’t admit the SR-71 existed until 1964 and decided ultimately to use it for reconnaissance and research into supersonic flight.  The SR-71 in 1976 set the world record for the fastest flight by an air-breathing manned aircraft and the mark still stands.

The delta form offers structural advantages and aerodynamic characteristics suited to the fluid dynamics of airflow in supersonic conditions.  To suit different applications, design variations have evolved, with and without additional stabilizing surfaces.  The long root chord of the delta wing and minimal structure outboard is inherently structurally efficient, able to be built stronger and stiffer yet lighter than a swept wing of equivalent lifting capability.  It’s thus simple and relatively inexpensive to build.

Avro Vulcan (1956-1984).

Until the UK adopted the submarine-launched Polaris missile system, the Vulcan was the platform for the UK’s independent nuclear deterrent and it remained in service long enough to be deployed for its only combat mission, a flight of five aircraft used for (conventional bombing) missions during the 1982 Falklands War.  Each aircraft flew almost 4000 miles  (6,500 km) from Ascension Island, Victor tankers used for the air-to-air refueling, almost 1.1 million gallons (5 million litres ) of fuel burned each mission.

The long root chord also allows a deeper structure for a given aerofoil section, providing more internal volume for fuel and other storage without a significant increase in drag although, on supersonic designs, designers often take the opportunity to use a thinner aerofoil instead, thereby further reducing drag.  Usefully, the large root chord also provides a large surface area which assists in reducing the minimum speed; a low landing speed being a design objective in most military and civil applications.  Delta wings can be designed to induce vortex lift, so flow separation can be turned into a means of increasing lift and the whole structure is naturally stable in pitch, therefore not requiring a separate tail surface.

Aérospatiale/BAC Concorde (1969-2003).

The Anglo-French supersonic passenger jet operated commercially between 1976-2003.  Flying at twice the speed of sound and carrying up to 128 passengers, it was the longest lasting of its time, the Soviet Tupolev Tu-144 in passenger service only for a few years during the 1970s after which it operated both as a freighter and a research platform and the American SST never progressed beyond engineering mock-ups.  The Americans worked out the economics were never going to make sense; the Soviets had a different relationship to money and the Concorde lasted as long as it did only because the French & British governments wrote-off the development costs.

There are drawbacks.  The large wing area creates more viscous drag for the same amount of lift compared to a high aspect ratio wing; swept wings have a better lift-to-drag ratio than deltas.  Also, high-lift devices like fowler flaps are hard to integrate into delta wings with the rearward location of the trailing edge producing intolerable pitching moments when such flaps would be deflected.  In short, delta wings are superior only in supersonic flight; their best known design probably the Anglo-French Concorde.

Lindsay Lohan in delta skirts.

A delta skirt is characterized by its triangular shape, an allusion to the Greek letter delta (Δ); almost always, a delta skirt is fitted at the waist, flaring out towards the hem, creating the triangular silhouette.  The concept is adaptable and can be made from just about any fabric, the most popular including cotton, taffeta, silk and a variety of other synthetics.  Delta skirts tend to be shorter because to produce the triangular effect as length increases either some sort of internal structure is required or additional material needs to be used, increasing bulk and weight.  Although most associated with younger women, they have been adopted by a number sub-sets from the anime aesthetic, Goths and bohemians to hippies.

Skunk

Skunk (pronounced skuhngk)

(1) Any of various American musteline mammals (of the weasel family) of the subfamily Mephitinae, especially the Mephitis mephitis (striped skunk), typically having a black and coat with a white, V-shaped stripe on the back and a bushy tail; infamous for the noxious smelling fluid sprayed from two musk glands (anal gland) at the base of the tail when alarmed or attacked

(2) In slang, a most contemptible person; a cheat, knave, scoundrel or stinker.

(3) In slang, anything very bad or a failure; something not a total failure yet with still badly flawed can be described as “skunky” although, in the way of such things, sub-sets of youth have repurposed “skunky” to mean “very good; highly regarded; most satisfactory” (al la the earlier inversion of “filth”), possibly under the influence of the famously potent strain of weed.

(4) In US Navy slang, an unidentified ship or target.

(5) In the slang of drug-users, a strain of Cannabis sativa & Cannabis indica with high levels of tetrahydrocannabinol (THC) (exceeding those of typical hashish), noted for its exceptionally powerful psychoactive properties (also as skunkweed, the name derived from its highly aromatic properties).

(6) In the slang of certain (mostly North American) sports, to defeat thoroughly in a game, especially when the opponent has been prevented from scoring.

(7) In the game of cribbage, a win by 30 or more points (a double skunk 60 or more, a triple skunk 90 or more).

(8) In brewing, of beer, to spoil.

(9) In popular culture, a person whose lifestyle (or as it’s representing in their fashion choices) is a hybrid of the skinhead and punk sub-culture, the construct being sk(inhead) + p(unk).

1625–1630: An early Americanism, described as the Massachusett reflex of the southern New England region Proto-Algonquian šeka·kwa, the construct being šek- (to urinate) + -a·kw (a fox, a fox-like creature); a similar form was noted as the Abnaki segākw, segôgw & segonku (he who squirts urinates).  The first application of the verb was in 1831 when it was used in sport to mean “to completely defeat; to prevent from scoring” and it was used as an insult as early as 1841.  In botany, a local cabbage which gave of a strongly pungent odor when bruised was in 1751 nicknamed skunk-cabbage, having been known as skunkweed since 1738 (botanically unrelated to the later use in drug culture although the etymological influence was similar).

Skunk hair.

The term “skunk hair” originally described a thick blonde highlight applied to dark hair but it’s now used of any two-tone combination (and strictly speaking, beyond two-color schemes it becomes a variegation). Skunk hair is derided by many who treat it as a class-identifier, associating it with those in lower socio-economic demographics, the folk who used to be labelled "not of the better classes".  However, it offers real advantages over other color-changes in that it's possible to design one to accommodate re-growth, something frankly impossible with conventional styles which almost always require maintenance and for true obsessives than can be even weekly.  While it's true there is a genuine "dark roots" aesthetic which on the right subject can be truly stunning, they're a rare breed so it's a niche market few choose to inhabit.  By contrast, a properly executed skunk can last for months.

Lindsay Lohan 2003 with what is sometimes now described as "skunk hair" although it's better understood as a coloring when the dark/light contrast is more dramatic.

Czech, Danish, German, Norwegian, Swedish and Slovak all adopted the English spelling, other variations including the Finnish skunkki, the French skunks, the Icelandic skunkur, the Japanese: スカンク (sukanku) and the Russian скунс (skuns).  In idiomatic use, the phrase “as welcome as a skunk at a garden party” refers to someone badly behaved who is unwelcome and actively avoided, the analogy essentially literal.  By contrast, “drunk as a skunk” means “highly inebriated” (also “skunked” in the vernacular) and belongs to a class of phrases which make no apparent sense and endure only because of their memorable rhyme although “drunk as a monk” may have come from empirical observation.  Usefully, in polite society, most are acceptable in a way the rhyming “drunk as a cunt” is not.  Skunk and skunks are nouns & verbs, skunking is a verb, skunked is an adjective & verb, skunky & skunkish are adjectives; the noun plural is skunks or (especially collectively) skunk.  The adverb skunkily is a non-standard form and the verb skunkify appears exclusive to drug and related cultures.

Skunkworks

Lockheed Martin’s Skunk Works logo.

A favored term in industries such as motorsport, aviation, defense, aerospace and ICT, a skunkworks is a research & development (R&D) facility within a large organization which exists to pursue special or urgent projects which can’t conveniently be pursued within the normal structures.  A skunkworks was originally a distinct physical space but latterly it’s been used also to describe concepts or projects and skunkworks can be either ad-hoc creations which are dissolved when their purpose has been fulfilled or they can evolve into permanent institutions.  One of the attractions of the skunkworks concept is that, properly implemented, it operates without the apparently inevitable bureaucracy which evolves in large corporations, stifling and suppressing new ideas.  In a skunkworks, the only administrative structures which exist are there directly to handle the needs of the project, unlike corporate bureaucracies which rather than being a means to an end, tend to become an impediment to the means.

Airframe nose-cone outside the skunkworks tent, circa 1943.

The origin of the term dates from 1943 when the Lockheed Aircraft Corporation needed urgently to develop a jet-engined pursuit (fighter) aircraft to counter the imminent threat intelligence suggested the allied air forces would soon face from German jet-fighters.  With war production operating at high-intensity, Lockheed’s factories were operating at 100% capacity and thus no space was available for the project so somewhere had to be found.  The details of quite what happened next have become the stuff of industry myth & legend but according to Lockheed-Martin’s official history, a large circus tent was rented and erected next to the closest available space which turned out to be adjacent to a processing facility which used processes emitting a strong odor.  These wafted over, permeating the tent and one of the engineers recalled the newspaper comic strip, "Li'l Abner," in which there was a running joke about a mysterious and malodorous place deep in the forest called the "Skonk Works" where a strong drink was brewed from skunks, old shoes and other strange ingredients.  One day, the engineer answered the telephone by saying "Skonk Works” and, in the way Chinese whispers work, his fellow employees decided it was the punchier “skunk works”, the name adopted by Lockheed as the official pseudonym for their Advanced Development Projects (ADP) division (now Advanced Development Programs).  There are variations of the story including which omits any mention of a tent, suggesting the ADP began in the mot-balled 3G distillery which still reeked with the smells of making bourbon but Lockheed-Martin has published a photograph of a prototype aircraft nose-cone with the tent in the background.

Lockheed P-80 Shooting Star.

The Lockheed P-80 Shooting Star was the first skunkworks project although the team did undertake some work on the P-38 Lightning, first flown in 1939.  The first P-80 was built in a remarkable 147 days which, even given the urgency of wartime production which tended to compress many development programs, did seem to vindicate the skunkworks concept.  The P-80 reflected the thinking of the time and essentially optimized the airframe of a piston-engined fighter around a jet engine.  In that sense it was a developmental cul-de-sac and future directions would be set by the German’s Messerschmitt 262, all designers influenced by the swept-wings and other aerodynamic enhancements which would define the next generation of fighters.  However, the P80’s design was fundamentally sound, in 1946 setting a new world speed record of 623.8 mph (1003.8 km/h) and versions were still used as front-line fighters in the Korean War (1950-1953) although the unexpected appearance in the skies of Russian-built Mikoyan-Gurevich MiG-15s (NATO reporting name: Fagot) saw the US rush to send squadrons of North American F86 Sabres to match the swing-wing threat.  However, some overseas customers used them as fighters as late as 1974 and so versatile did the platform prove that it continued to be developed in a number of roles including reconnaissance, the US military maintaining a fleet as jet-trainers until well into the 1990s.

Lockheed Martin SR-72 conceptual rendering.

Other skunkworks projects of note include the U-2 spy plane which played a notable role during the Cold War, the F-104 Starfighter which earned two nicknames (“the manned missile” & “the widow maker”; a brace which may be thought of as cause and effect), the high-speed, high-altitude SR-71 Blackbird which in the 1960s which set records which stand today and the F-22 Raptor, thirty-odd years on still the world’s most capable short-range interceptor which would have been produced in much greater numbers had not the USSR dissolved, ending the notion of dog-fights over Berlin being part of the Pentagon’s war-planning.  Much of their work appears now to be devoted to hypersonic (Mach 5 (5 x the speed of sound and beyond)) unmanned aerial vehicles (which should be called "UAVs", the common moniker "drone" not appropriate for these)) platforms for one purpose and another.  Most of the projects are thus far still vaporware although there have been notable advances in systems and specific components but the most dramatic (and best publicized), the SR-72 seems unlike to proceed even to the prototype stage although the speculated shape does suggest the engineers who ran the numbers on the Concorde's wind-tunnel sessions in the 1960s did their sums correctly.  Whatever form of hypersonic UAV eventually does emerge from the skunkworks, it will be armed with hypersonic missiles, a necessity because if existing missiles were used, the thing would shoot itself down.

Belt

Belt (pronounced belt)

(1) A band of flexible material, as leather or cord, used for encircling the waist, historically to in some way secure a garment (coat or trousers) but also as a decorative or functional (tool belt, utility belt, gun belt etc) item.

(2) In any context, any encircling or transverse band, strip, or stripe.

(3) In geography, an elongated region having distinctive properties or characteristics.

(4) In machinery, an endless flexible band passing about two or more pulleys, used to transmit motion from one pulley to the other or others or to convey materials and objects.

(5) In (usually military) ballistics, a cloth strip with loops or a series of metal links with grips, for holding cartridges fed into an automatic gun.

(6) A band of leather or webbing, worn around the waist and used as a support for weapons, ammunition etc.

(7) In naval architecture, a series of armor plates forming part of the hull of a warship.

(8) In construction, a broad, flexible strip of rubber, canvas, wood, etc., moved along the surface of a fresh concrete pavement to put a finish on it after it has been floated.

(9) A road, railroad, or the like, encircling an urban center to handle peripheral traffic (as beltway also used in political discourse).

(10) In slang, a hard blow or hit (often in the forms belted or belting), either a person or an object (the latter noted especially in bat & ball sports).

(11) In slang, a shot of liquor, especially as swallowed in one gulp (often in the form “a quick belt”).

(12) In tyre technology, strip of material used in tyre construction, placed between the carcass and the tread for reinforcement (in the forms steel-belted & fabric-belted).

(13) In sport, in a color based ascendency (brown, black etc), a ranking system in various martial arts).

(14) In sport (notably boxing), a form of trophy worn by the holder of a title (WBO Heavyweight Belt, IBF Cruiserweight Belt etc).

(15) As seat belt, an apparatus used in air, sea & land vehicles to secure a passenger, pilot, driver etc in place.

(16) To gird or furnish with a belt.

(17) To surround or mark as if with a belt or band.

(18) In slang, as “belt out”, loudly (though not necessarily pleasingly) to sing or, as “belting along”, rapidly to proceed.

(19) In cricket, as “belter”, a description of a placid pitch ideal for batting and offering little assistance to bowlers.

(20) In astronomy, a collection of small bodies (such as asteroids) which orbit a star; one of certain girdles or zones on the surface of the planets Jupiter and Saturn, supposed to be of the nature of clouds.

(21) In baseball, the part of the strike zone at the height of the batter's waist.

(22) In music, a vocal tone produced by singing with chest voice above the break (or passaggio), in a range typically sung in head voice.

(23)To invest a person with a belt as part of a formal ceremony (even one where as physical belt is not involved or even a historic part).

Pre 1000: From the Middle English belt, from the Old English belt (belt; girdle; broad, flat strip or strap of material used to encircle the waist), from the Proto-Germanic baltijaz (girdle, belt) (source also of the Old High German balz, the Old Norse balti & belti and the Swedish bälte), an early Germanic borrowing from the Latin balteus (belt, girdle, sword-belt) which may be of Etruscan origin.  It was cognate with the Scots belt (belt), the Dutch belt, the German Balz (belt), the Danish bælte (belt), the Swedish bälte (belt, cincture, girdle, zone) and the Icelandic belti (belt).    Synonyms vary according to context including circle, girdle, surround (to encircle), buckle, fasten, strap (to fasten a belt); bash, clobber, smack, wallop. strap, thrash, whip (to hit with a belt); gulp, slurp, guzzle (rapidly to drink); speed, whiz, zoom (rapidly to move).  Belt is a noun & verb, belted is a verb & adjective, belting is a noun, verb & adjective and belter is a noun; the noun plural is belts.

Lindsay Lohan in trench coat, the belt tied and not buckled.

The verb emerged in the early fourteenth century in the sense of “to fasten or gird with a belt” and was derived from the noun.  The meaning "to thrash (as with a belt)" was from the 1640s while the general sense of "to hit, thrash" seems not to have been used until 1838. The colloquial meaning "to sing or speak vigorously" dates from 1949 and was first used in the US, south of the Mason-Dixon Line.  As a development, the noun meaning "a blow or stroke" dates from 1885.  The transferred sense of "broad stripe encircling something with its ends joined" dates from the 1660s while that of a "broad strip or tract" of any sort, without notion of encircling (as in the “wheat belt") emerged by 1808.  As a mark of rank or distinction (sometimes associated with a specific honor in the form of a belt or sash), use began in the mid-fourteenth century and in pugilism, boxing championship belts were first awarded in 1812.  The use in mechanical engineering (drive belts, pulley belts, serpentine belts etc) was first noted in 1795.  The sword-belt dates from the early fourteenth century while the Old English had sweordfætels (sword-belt).  The adjective beltless came from the fashion industry to describe a style without a belt and was from 1854, the belt-loop (through which a belt passes) noted the following year (although such things had existed for centuries).  In the sub-culture of the trench coat, the military tradition was always to use the buckle to secure the belt while true fashionistas prefer to tie, bucklers thought a bit naff.

Lindsay Lohan demonstrates the possibilities offered by belts.

Many languages adopted belt including those of the Raj, the Hindi being बेल्ट (belṭ), the Bengali বেল্ট (belṭ) & the Urdu بیلٹ‎ (belṭ); Afrikaans picked up belt from the Dutch and other variations were the Assamese বেল্ট (belto), the Irish beilt (Welsh & Scots picked up belt), the Japanese: ベルト (beruto) and the Oriya ବେଲ୍ଟ୍ (belṭ).  If used as a proper noun (a surname or place-name), it appears always with an initial capital.  In astronomy, there’s no initial capital when used as a general descriptor but one is used when referring to a specific region (eg as an ellipsis of Main Asteroid Belt).  The Belt and Road Initiative (BRI, or B&R and known originally as One Belt One Road (OBOR)) of the People’s Republic of China (PRC) is a trans-national infrastructure project (the strategy of which depends on who is providing the interpretation) dating from 2013 and integral to the PRC’s foreign policy.  As physical infrastructure, it’s analogous with the old Silk Road, the ancient trade route which linked China with the West, carrying goods and (more dangerously) ideas between the two great civilizations of Rome and China.

Lindsay Lohan beltless  (or un-belted).

In idiomatic use, “below the belt” means “not in accord with the principles of fairness, decency, or good sportsmanship” and was drawn from the rules of boxing where restrictions were maintained on blows to the genitals.  To have something “under one's belt” is to have something in one’s literal or figurative (a qualification or achievement) possession.  To tighten one’s belt is “to be more frugal; to undergo hardship patiently” and is often used as an injunction by politicians (directed at others).  Charlie Chaplin (1889-1977) invented “tighten the belten” for the faux German used in his film The Great Dictator (1940).  The use to describe specific regions can be literal (wheat belt, corn belt etc), meteorological (sun-belt, snow-belt) or more figurative (mortgage belt, Bible belt etc), the latter probably more accurately described as “zones” but the meaning is well-understood and some have emerged recently (such as rust belt which refers to once vibrant industrial areas now in economic decline).  A beltway is a road system which encircles (not necessarily in a circular design) a city and is intended to reduce congestion in the inner region; the phrase “beyond the beltway” is US political slang to differentiate the interests and priorities of those “within the beltway” of Washington DC (ie the political class (executive government, the congress, the upper reaches of the civil service etc)) and the general population.  The US term references Interstate 495 around Washington DC (the Capital Beltway, opened in 1964), the figurative use (the culture of the political class) dating from 1978, exclusively in the negative.

Lindsay Lohan demonstrates more possibilities offered by belts.

Seat belts, although began in any volume to be fitted only in the 1960s although they’d been used in ships (both by fishermen and in the navy) and in the early day of aviation without ever becoming standardized fittings although, in a sense, as a safety restraint they were known even in Antiquity.  In Greek mythology, the Sirens were deadly creatures who used their lyrical and earthly feminine charms to lure sailors to their death; attracted by their enchanting music and voices, seafarers would sail their ships too close to the rocky coast of the Siren’s island and be shipwrecked.  Not untypically for the tales from antiquity, the sirens are said to have had many homes.  The Romans said they lived on some small islands called Sirenum scopuli while later authors place them variously on the islands of Anthemoessa, on Cape Pelorum, on the islands of the Sirenuse, near Paestum, or in Capreae.  All were places with rocky coasts and tall cliffs.  It was Odysseus who most famously escaped the sirens.  Longing to hear their songs but having no wish to be ship-wrecked , he had his sailors fill their ears with beeswax, rendering them deaf and to be certain, Odysseus ordered them to tie him to the mast, thereby inventing the seat-belt.  Sailing past, when he heard their enticing voices, he ordered his men to release him but they tightened the knots, not releasing him till the danger had passed.  Some writers claimed the Sirens were fated to die if a man heard their singing and escaped them and that as Odysseus sailed away they flung themselves into the water and died.

Lindsay Lohan demonstrates still more possibilities offered by belts.

Knocking back a bracer: Crooked Hillary Clinton enjoys a quick belt of Crown Royal Bourbon Whiskey, Bronko's restaurant, Crown Point, Indiana, Saturday 12 April, 2008.

In the late 1940s, the rising death toll attracted interest but few cars were at the time fitted with seat-belts and research was difficult with such small sample sizes although it was indicated there was some positive although instances were also noted of injuries being caused by the belts’ then primitive and unregulated design and it was these findings which encouraged the first “inertial reel” (retractable) designs.  A couple of US manufacturers during the 1950s dabbled with the concept, either installing seat belts as standard or offering them as an extra-cost option but the take-up rate was low and some buyers ever returned the cars to dealers to have them removed.

The familiar modern three-point (lap & sash) belt evolved in the late 1950s with much input from US designers but it was Swedish manufacturers which first made them a standard fitting, Scandinavia being often dark and icy, drivers sharing the roads with large elk.  The modern seatbelt design (conceptually unchanged to this day) is credited to Swedish mechanical engineer Nils Bohlin (1920–2002) who was employed by Volvo which made them a standard fitting in 1959, following the example of Saab which had added them the previous year.  During the 1960s, US states gradually imposed a requirement they be fitted until, in 1969, federal law mandated the rule for all cars sold in the country.  The laws requiring them actually to be worn proved more difficult to implement but other countries quickly made both the fitment and wearing of seat-belts compulsory, initially only for those seated in the front seat(s) but before long it extended to all seats.

Instruction sheet for Child Bed (1961 Chevrolet Corvair), Chevrolet Division of General Motors (GM) part-number 985359.

Attitudes to motor vehicle safety were different in 1959 when Chevrolet first started making the Corvair (1959-1969).  At the time, apart from improving the quality of roads (which actually meant higher speeds) the government had done little about either safety or pollution but both the rising highway death toll and the worsening air quality in cities was attracting attention and things would soon be different, decades of legislation soon to unfold.  The Corvair however was a product of a substantially unregulated age and in that spirit Chevrolet thoughtfully offered the “child bed” as an accessory so one’s baby could sleep (unsecured) on the parcel shelf beneath the rear window, the additional benefits of the placement said to be that being rear-engined, the warmth and soothing vibration from the engine gently would lull the infant to sleep.  It was another world.

An early Chevrolet Corvair with swing axles, swinging.

The Corvair was doomed by decisions made even before production began.  It was anyway the twilight of the rear-engined era and although swing axles in Europe proved surprisingly persistent (usually because the design provided a relatively cheap way to implement an independent rear suspension) few installed them on a car as heavy and powerful as the Corvair.  Mercedes-Benz, which was an adherent (despite their experience with the superior De Dion layout) was still producing a handful of 600s (the W100 Grosser) with swing axles as late as 1981 but the Germans tamed the behavior with special anti-squat & anti-dive geometry as well as a compensating centre spring.  Chevrolet did not and with a weight distribution which was even more exaggerated rearward by its relatively heavy and long engine, the Corvair’s handling could be unpredictable, something which the engineers wanted to alleviate by fitting a handful of parts (the cost under US$40) but this the accountants vetoed.  The ensuing crashes, death toll and law suits attracted the interest of consumer lawyer Ralph Nader (b 1934) who wrote Unsafe at Any Speed (1965), a critique on the industry generally although in the public mind it’s always been most associated with the failings of the Corvair which the author made the subject of the opening chapter.

The Corvair before and after.  GM applied a fix in 1963 which rectified the worst of the characteristics and a full re-design was undertaken and released in 1965.  For the Corvair's reputation it was too late.

Actually, the problems as described applied only to the Corvairs built between 1959-1963 but the damage was done, neither its reputation or sales figures ever recovered and it was only the corporation’s desire to save face which saw the much improved car restyled for 1966, production lingering on until 1969 although it may be Nader’s book actually prolonged things, competition in the compact sector notably more intense that in 1960s.  It was unfortunate because the restyled Corvair was one of the better-looking machines of the era, only the truncated length of the bodywork forward of the cowl detracting from the elegance.

The lovely, Italianesque lines of the second generation Corvair (1966-1969).

Curiously, after its demise came a coda.  In 1970, responding to pressure from Nader, the Nixon administration commissioned a study comparing the 1963 Corvair with five “similar” vehicles and a report was in 1972 issued by the National Highway Traffic Safety Administration (NHTSA) which concluded, inter alia, the Corvair’s handling and propensity to roll was comparable with that of “other light domestic cars.”  Nader dismissed the study as “a shoddy, internally contradictory whitewash” and accused the NHTSA of using “biased testing procedures and model selection.”  He noted they assessed on the 1963 Corvair which Chevrolet significantly had modified to correct the deficiencies found in those built earlier.  The Nixon administration ignored him, presumably taking the view that “what was good for General Motors was good for the country”.

Lindsay Lohan demonstrates yet more possibilities offered by belts.  A belt will usually include a loop next to the buckle, used to keep the end of the belt in place.  This is called the "keeper".

Phytosuccivorous

Phytosuccivorous (pronounced fahy-toh-suhk-siv-er-uhs)

The general descriptor of creatures which feed on sap, such as certain sucking insects.

1860s: The construct was phyto- + succi- + -vorous.  Phyto- (pertaining to or derived from plants) was from the Ancient Greek φυτόν (phutón) (plant) and a doublet of -phyte.  Succi- was a combining for of the Latin succus (plural succi) (juice), source also of the Modern English succulent.  In pre-modern medicine, succus & succi were terms for the expressed juice of a plant, extracted for medicinal purposes.  The construct of –vorous was the Latin –vor(us) + -ous.  Vorous was from vorō (I devour, greedily I eat) +‎ -us (the suffix used to form adjectives) and the suffix –vorous was used to form adjectives with the sense of “habitually eating, feeding on”.  The –ous suffix was from the Middle English -ous, from the Old French –ous & -eux, from the Latin -ōsus (full, full of); a doublet of -ose in an unstressed position.  It was used to form adjectives from nouns, to denote possession or presence of a quality in any degree, commonly in abundance.  In chemistry, it has a specific technical application, used in the nomenclature to name chemical compounds in which a specified chemical element has a lower oxidation number than in the equivalent compound whose name ends in the suffix -ic.  For example sulphuric acid (H₂SO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).  The related forms, used in entomology and the biological sciences include phytosuccivorous, phytosuccivore & phytosuccivory.

Originally described in entomological taxonomy the H. coagulata (later called Homalodisca vitripennis), is a leafhopper from the insect family Cicadellidae.  The surprisingly destructive little bug was later and more mnemonically named the glassy-winged sharpshooter, a not entirely accurate but graphically illustrative description.  Being phytosuccivorous means the insect lives by sucking sap from the plants which make its environment hospitable.  That’s unremarkable but the glassy-winged sharpshooter is one of a number of sap-suckers noted for a still curious aspect of their behavior: They “make it rain” by flinging droplets of pee while feeding on plant juices.  Although the reason the creatures have evolved to do this remains speculative, close observation has allowed biologists to understand the tiny, catapult-like mechanism the sharpshooters use to propel their waste at what turned out to be extraordinary rates of acceleration.

It’d long been known that trees infested with sharpshooters exude a steady pitter-patter of pee and many nature-loving bush-walkers may have probably enjoyed the experience, thinking it a natural climatic phenomenon.  Use of high-speed video capture allowed scientists to observe the process and analysis revealed how the insects release the waste.  Of interest also was that sharpshooters frequently simultaneously “feed & fling”, droplets collecting on a tiny barb called a stylus at the insect’s rear end which, when the droplet reaches a certain weight, induces the stylus to act like spring, the drop flying off the structure as if hurled from a catapult.

In an intriguing example of the complexity of nature often observed at the miniature level, two tiny hairs at the end of the stylus which, by flicking the water at the point of ejection, greatly increase the flinging power (because of the scale, an aspect of design not able to be added to any of the catapults made by humans since antiquity).  As a result, the stylus launches liquid waste with a maximum acceleration 20 times that of Earth’s gravity.  Impressive though that sounds, such findings are not unusual in the physics of very small creatures and it remains uncertain why the pee is flung so far, the current thinking being the sharpshooters try to send it as far as possible lest the sugar-rich fluid attracts predators.  Nor, despite the name, is there any suggestion the sharpshooters are aiming at anywhere or anything in particular, their interest apparently distance rather than direction.  The researchers hope their findings will improve engineering in the field of microfluidics, in which tiny amounts of fluids are manipulated to diagnose disease, sequence DNA, and study cells one at a time.  Already, engineers are experimenting with a design which emulates the sharpshooter's rear end by attaching false eyelashes to an electric motor.

Small though they are, where colonies cluster, the sharpshooters can do serious damage.  The phytosuccivorous pests daily slurp-down and fling-out hundreds of times their body weight and can transmit bacteria that cause diseases in plants and poison the spiders which play a vital role in maintaining insect numbers.  Their technique of feeding and voracious appetite for so many different hosts means the glassy-winged sharpshooters are an effective vector for a number of bacteria which colonizes the creature by forming a biofilm on its mouth-parts.  The infected insect then transmits the disease to additional plants while feeding and even if not susceptible, the newly infected plant becomes a reservoir, holding the bacterium for other sap-suckers to pick up and carry to other plants.  There have been a number of successful attempts at pest management including the use of insecticides, parasitoids (especially wasps) and the impact of naturally occurring pathogens like viruses, bacteria, and fungi, one recently discovered pathogen actually a virus conveniently specific to sharpshooters.  Evidence suggests the most successful approach is the release of broad-spectrum leafhopper parasitoids which reduce the survival rate of the eggs.