Float

Float (pronounced floht)

(1) To rest, move or remain on the surface of a liquid (to be buoyant; to be supported by a liquid of greater density, such that part (of the object or substance) remains above the surface) or in the air.

(2) By metaphor, to move lightly and gracefully.

(3) By metaphor, information or items circulating.

(4) Figuratively, to vacillate (often followed by between).

(5) As applied to currencies, to be allowed freely to fluctuate in the foreign-exchange market instead of being exchanged at a fixed or managed rate.

(6) In the administration of interest rates, periodically to change according to money-market conditions.

(7) In the equities markets, the offering of previously privately held stock on public boards; an offering of shares in a company (or units in a trust) to members of the public, normally followed by a listing on a stock exchange.

(8) In the bond markets, an offering.

(9) In theatre, to lay down (a flat), usually by bracing the bottom edge of the frame with the foot and allowing the rest to fall slowly to the floor.

(10) An inflated bag to sustain a person in water; life preserver.

(11) In plumbing, in certain types of tanks, cisterns etc, a device, as a hollow ball, that through its buoyancy automatically regulates the level, supply, or outlet of a liquid.

(12) In nautical jargon, a floating platform attached to a wharf, bank, or the like, and used as a landing; any kind of buoyancy device.

(13) In aeronautics, a hollow, boat-like structure under the wing or fuselage of a seaplane or flying boat, keeping it afloat in water (aircraft so equipped sometimes called “float planes”).

(14) In angling, a piece of cork or other material for supporting a baited line in the water and indicating by its movements when a fish bites.

(15) In zoology, an inflated organ that supports an animal in the water; the gas-filled sac, bag or body of a siphonophore; a pneumatophore.

(16) A vehicle bearing a display, usually an elaborate tableau, in a parade or procession.

(17) In banking, uncollected checks and commercial paper in process of transfer from bank to bank; funds committed to be paid but not yet charged against the account.

(18) In metal-working, a single-cut file (a kind of rasp) of moderate smoothness.

(19) In interior decorating, a flat tool for spreading and smoothing plaster or stucco.

(20) In stonemasonry, a tool for polishing marble.

(21) In weaving and knitting, a length of yarn that extends over several rows or stitches without being interworked.

(22) In commerce, a sum of physical cash used to provide change for the till at the start of a day's business.

(23) In geology and mining, loose fragments of rock, ore, etc that have been moved from one place to another by the action of wind, water etc.

(24) To cause something to be suspended in a liquid of greater density.

(25) To move in a particular direction with the liquid in which one is floating (as in “floating downstream” etc).

(26) In aviation, to remain airborne, without touching down, for an excessive length of time during landing, due to excessive airspeed during the landing flare.

(27) To promote an idea for discussion or consideration.

(28) As expression indicating the viability of an idea (as in “it’ll never float”, conveying the same sense as “it’ll never fly”).

(29) In computer (graphics, word processing etc), to cause an element within a document to “float” above or beside others; on web pages, a visual style in which styled elements float above or beside others.

(30) In UK use, a small (often electric) vehicle used for local deliveries, especially in the term “milk float” (and historically, the now obsolete “coal float”).

(31) In trade, to allow a price to be determined by the markets as opposed to by rule.

(32) In insurance, premiums taken in but not yet paid out.

(33) In computer programming, as floating-point number, a way of representing real numbers (ie numbers with fractions or decimal points) in a binary format

(34) A soft beverage with a scoop of ice-cream floating in it.

(35) In poker, a manoeuvre in which a player calls on the flop or turn with a weak hand, with the intention of bluffing after a subsequent community card.

(36) In knitting, one of the loose ends of yarn on an unfinished work.

(37) In transport, a car carrier or car transporter truck or truck-and-trailer combination; a lowboy trailer.

(38) In bartending, the technique of layering of liquid or ingredients on the top of a drink.

(39) In electrical engineering, as “float voltage”, an external electric potential required to keep a battery fully charged

(40) In zoology, the collective noun for crocodiles (the alternative being “bask”).

(41) In automotive engineering, as “floating axle”, a type of rear axle used mostly in heavy-duty vehicles where the axle shafts are not directly attached to the differential housing or the vehicle chassis but instead supported by bearings housed in the wheel hubs.

Pre 1000: From the Middle English floten, from the Old English flotian (to float), from the Proto-Germanic flutōną (to float), from the primitive Indo-European plewd- & plew- (to float, swim, fly).  It was cognate with the Saterland Frisian flotje (to float), the West Frisian flotsje (to float), the Dutch vlotten (to float), the German flötzen & flößen (to float), the Swedish flotta (to float), the Lithuanian plaukti, the Middle Low German vloten & vlotten (to float, swim), the Middle Dutch vloten, the Old Norse flota, the Icelandic fljóta, the Old English flēotan (to float, swim), the Ancient Greek πλέω (pléō), the Lithuanian plaukti, the Russian пла́вать (plávatʹ) and the Latin plaustrum (wagon, cart).  It was akin to the Old English flēotan & Old Saxon flotōn (root of fleet).  The meaning “to drift about, passively to hover" emerged circa 1300 while the transitive sense of “to lift up, to cause to float (of water etc)” didn’t come into use for another 300-odd years and the notion of “set (something) afloat” was actually originally figurative (originally of financial matters) and noted since 1778.  Float was long apparently restricted to stuff in the water and didn’t come into use to refer to things in the air until the 1630s, this extending to “hover dimly before the eyes” by at least 1775.   In medicine, the term “floating rib” was first used in 1802, so called because the anterior ends are not connected to the rest.  The Proto-Germanic form was flutojanan, from the primitive Indo-European pleu (to flow) which endures in modern use as pluvial.

Etymologists have concluded the noun was effectively a merger in the Middle English of three related Old English nouns: flota (boat, fleet), flote (troop, flock) & flot (body of water, sea), all from the same source as the verb.  The early senses were the now-mostly-obsolete ones of the Old English words: the early twelfth century “state of floating"”, the mid thirteenth century “swimming”, the slightly later “a fleet of ships; a company or troop” & the early fourteenth century “stream or river”.  From circa 1300 it has entered the language of fishermen to describe the attachments used to add buoyancy to fishing lines or nets and some decades later it meant also “raft”.  The meaning “a platform on wheels used for displays in parades etc” dates from 1888 and developed either from the manner they percolated down a street on from the vague resemblance to flat-bottomed boat which had been so described since the 1550s.  The type of fountain drink, topped with a scoop of ice cream was first sold in 1915.

The noun floater (one who or that which floats) dates from 1717 as was the agent noun from the verb.  From 1847 it was used in political slang to describe an independent voter (and in those days with the implication their vote might be “for sale”), something similar to the modern “swinging voter”.  By 1859 it referred to “one who frequently changes place of residence or employment” and after 1890 was part of US law enforcement slang meaning “dead body found in the water”.  The noun flotation dates from 1765, the spelling influenced by the French flotaison.  The adverb afloat was a direct descendent from the Old English aflote.  In idiomatic use, it was the boxer Muhammad Ali (1942–2016) who made famous the phrase “float like a butterfly; sting like a bee” and “whatever floats your boat” conveys the idea that individuals should be free to pursue that which they enjoy without being judged by others.  To “float someone’s boat” is to appeal to them in some way.  Float is a noun & verb, floater is a noun, floated is a verb, floating is a noun, verb & adjective and floaty is a noun & adjective; the noun plural is floats.

Lindsay Lohan floating in the Aegean, June 2022.

In the modern age, currencies began to be floated in the early 1970s after the collapse of the Bretton Woods system (1944) under which most major currencies were fixed in relation to the US dollar (which was fixed to gold at a rate of US$35 per ounce).  That didn’t mean the exchange rates were static but the values were set by governments (in processes called devaluation & revaluation) rather than the spot market and those movements could be dramatic: In September 1949, the UK (Labour) government devalued Sterling 30.5% against the US dollar (US$4.03 to 2.80).  The Bretton Woods system worked well (certainly for developed nations like the US, the UK, Japan, Canada, Australia, New Zealand and much of western Europe) in the particular (and historically unusual) circumstances of the post-war years but by the late 1960s, with the US government's having effectively printed a vast supply of dollars to finance expensive programs like the Vietnam War, the nuclear arms build-up, the “Great Society” and the space programme, and social programs, surplus dollars rapidly built up in foreign central banks and increasingly these were being shipped back to the US to be exchanged for physical gold bars.  In 1971, the Nixon administration (1969-1974) responded to the problem of their dwindling gold reserves by suspending the convertibility, effectively ending the Bretton Woods system and making floating exchange probably inevitable, the trend beginning when Japan floated the Yen in 1973.

A Bloomberg chart tracking the effect of shifting the US dollar from its link with gold to a fiat currency.  Due to this and other factors (notably the oil price), in the 1970s, the bills of the 1960s were paid.

Others however moved more slowly, many adopting the tactic of the Australian government which as late as 1983 was still running what was known as a “managed float”, an arrangement whereby the prime-minister, the treasurer and the head of the treasury periodically would meet and, using a “a basket of currencies”, set the value of the Australian dollar against the greenback and the other currencies (the so-called “cross-rates”).  Now, most major Western nations have floating currencies although there is sometimes some “management” of the “float” by the mechanism of central banks intervening by buying or selling.  The capacity for this approach to be significant is however not as influential as once it was because the numbers in the forex (foreign exchange) markets are huge, dwarfing the trade in commodities bonds or equities; given the volumes, movements of even fractions of a cent can mean overnight profits or losses in the millions.  Because some "floats" are not exactly "free floats" in which the market operates independently, there remains some suspicion that mechanisms such as "currency pegs" (there are a remarkable variety of pegs) and other methods of fine tuning can mean there are those in dark little corners of the forex world who can benefit from these manipulations.  Nobody seem prepared to suggest there's "insider trading" in the conventional sense of the term but there are some traders who appear to be better informed that others. 

Orifice

Orifice (pronounced awr-uh-fis or or-uh-fis)

A mouth, opening or aperture, as of a tube or pipe; a mouth-like opening or hole; mouth; vent (mostly technical or medical use).

1535–1545: From the Middle English orifice (an opening, a mouth or aperture), from the Old French & Middle French orifice (the opening of a wound), from the Late Latin ōrificium (an opening (literally "the making of a mouth")), the construct being Latin ōr- (stem of ōs (genitive oris)) (mouth (and related to "oral")) + fic- (combining form of facere; facio) (to make, to do) + -ium (the noun suffix).  The root of facere was the primitive Indo-European dhe- (to set, put).  The rare adjectival form is orificial; neither orificish or orificesque apparently exist.

Miss Schilling’s Orifice

Rolls-Royce Merlin V12.

Fuel to early versions of the twenty-seven litre (1648 cubic inch) Rolls-Royce Merlin V12 engine was supplied with a carburetor, putting the pilots in the Merlin-powered Spitfires and Hurricanes at a disadvantage against the German Messerschmitt BF109 fighters which used a fuel-injected Daimler-Benz DB601 inverted V12.  In the British planes, during a negative G-force maneuver (pitching the nose hard down), fuel was forced upwards to the top of the carburetor's float chamber rather than into the combustion chamber, leading to a loss of power. If the negative G continued, the fuel would collect in the top of the float chamber, forcing the float to the bottom. This in turn would open the needle valve to maximum, flooding the carburetor with fuel, drowning the supercharger with an over-rich mixture which would shut down the engine, a serious matter in aerial combat.

Battle of Britain era Hawker Hurricane Mk IIA and Supermarine Spitfire Mk II.

Ms Beatrice “Tilly” Shilling (1909-1990) was a pre-modern rarity, a female engineer and amateur racing driver.  While employed as an engineer at the Royal Aircraft Establishment (RAE) at Farnborough she worked on the fuel delivery problem, concluding quickly the only complete solution for fuel starvation was a pressurized fuel system such as the direct injection on the Daimler-Benz V12s but that such a development would take months to design, test, manufacture and install.  However, as a stop-gap measure, she designed a flow restrictor: a small metal disc with a central orifice, looking much like a plain metal washer.  The restrictor orifice was sized to accommodate just the fuel flow needed for maximum engine power, the setting usually used during dogfights and it solved the immediate, critical, problem of the engine shutdowns following flooding.  Officially named the RAE Restrictor or RAE Anti “G” Carburetor, the device proved popular with pilots, who much preferred to call it Miss Shilling's orifice or the Tilly orifice.  The simple and elegant solution proved effective until pressurized carburetors (essentially throttle-body injection, a simplified version of the Daimler-Benz direct fuel injection) were developed which permitted even inverted flight.  With a backpack of RAE Restrictors, she toured RAF airfields on her motor-bike instructing and assisting the maintenance crews with the installation of the devices.

RAE Anti "G" carburetor restrictor plate instruction sheet.

Ms Shilling was a serious engineer making an important contribution to the war effort and was not amused by the nick-names for her invention but reportedly regarded it as something typical of minds of men and carried on with her work.  The orifice was but a footnote in the history of the Merlin and the Allied war effort but did typify the improvisation and speed with which British industry developed "quick & dirty" solutions, especially in the early days of the war.

Desmodromic

Desmodromic (pronounced des-moh-drom-ick)

(1) In internal combustion engines, a valve drive-train in which poppet valves are positively closed by a cam and leverage system, rather than a conventional spring.

(2) By extension, in various mechanical devices, a component having different controls for its actuation in different directions.

1953:  A construct from the Ancient Greek δεσμός (desmós) (band, connection; fibrous connection, ligament; bond or knot) + δρόμος (drómos) (a course; travel; road).  The etymology is likely oblique to all but mechanical engineers but denotes the characteristic of valves continuously being "bound" to the camshaft.  The idea of desmo + dromic is thus often deconstructed as something like “running in unison” or “connected racing” but that’s because of the historic association with engines and speed and the desmo- prefix is also used in medicine and other biological sciences in the sense of “being or maintaining a connection”, a desmosome a filament-like substance with which cells adhere to each-other and desmoplakin" is the protein associated with this intercellular junction.  In zoology, the term most closely analogous to desmodromic valve trains is desmopelmous, a type of foot in birds in which the hind toe cannot be bent independently because planter tendons are united (ie they are connected and work in unison).

Conventional valve activation (left) versus desmodromic (right).

Probably as soon as there were poppet valves engineers began to ponder way of perfecting their opening and closing, the use of a spring for the latter effective but inexact and embryonic ideas would have been discussed but it was the German Daimler company which was first granted a patent for a desmodromic like valve-train system for a V-twin engine in 1889.  After that, designs, prototypes and even the odd racing car appeared so equipped and while there was some success on the track, no manufacturer attempted mass-production because of the high costs inherent in the intricate design and, more practically, the formidably frequency with which the system demanded adjustment to maintain perfect operation.  However, as the trophies won in competition had celebrated, the desmodromic arrangement uniquely permitted very high engine speeds and thus more power without the need to increase displacement and therefore bulk and weight.

A desmodromic valve schematic.

During World War II, there were great advances in metallurgy and the design of internal combustion engines and one manufacturer which had learned much was Daimler-Benz which had perfected the pressurized fuel-injection system which early in the conflict had given Luftwaffe pilots some real advantages over the allied opposition which continued to rely on primitive carburettors for fuel delivery, these adversely affected by gravity while the German aircraft were not.  However, the valve-train relied still on a spring to effect closing and this was a limitation which prevented the advantages of fuel-injection being fully explored.  The big aero-engines in the wartime Messerschmitts has been low-revving so the valve-springs weren’t challenged by physics but the company’s interest has returned to the race tracks and there, the systems limitations were exposed, “valve-float” intruding at high engine speeds.  The dreaded valve float is a phenomenon which occurs at high engine speeds when valve springs can’t return the valves to their seat with the cam follower still in contact with the cam.  This means the valves can be launched too high, even to the point where it can be still wide open when the piston arrives at the top dead centre (TDC), something which in the worst case can result in impact between the two, bending or even snapping the valve.  That will often be catastrophic, the debris perforating and possibly collapsing the hot aluminium piston head.  From that point on, the damage caused will be a matter only of extent, ranging from severe to complete destruction.

The Mercedes-Benz W196 Formula One Grand Prix (1954-1955) car used the desmodromic straight-eight in 2.5 litre form.  A 3.0 litre version was created for the W196S (300 SLR) used in sports car racing.  

That was something desirable to avoid in any engine but especially so in a racing car because, as the saying goes, “to finish first, first one must finish”.  Thus was designed Daimler-Benz’s surprisingly simple desmodromic system for the Mercedes-Benz W196 Formula One car for the 1954 season, ruin under the new 2.5 litre (152 cubic inch) displacement rule.  An amusing mix of new (fuel-injection and the desmodromics) and old (archaic swing axles and a straight-eight configuration), it succeeded, dominating the World Championship in 1954-1955 and in 3.0 litre form as the 300 SLR (technically the W196S), sports car racing too.  One thing which proved vital in all this was that the engineers had removed from the desmodromic hardware the small, final closing spring which had previously been thought necessary.  What the Daimler-Benz engineers discovered was that if a residual clearance of a mere 0.03 mm (0.001181099 inch) was machined, by simply leaving the return “desmo valve” in the closed position, the inertia of the valve and the gas pressure in the cylinder was sufficient to maintain the closure, a variation of the exploitation of the long-documented behaviour of fluid dynamics Chrysler would soon market (somewhat opportunistically) as Sonoramic.  The innovation was made possible by the development of metals stimulated by the demands of war; in the pre-war years, the desmodromic design adopted for the W196 simply wouldn’t have been possible.

Schematic of the Mercedes-Benz W196 straight-eight.

The desmodromic valve control system used an opening cam which directly controlled a shoe at the upper end of the cylindrical tappet rod while another (closing) cam used a deliberately out-of-alignment rocker arm which engaged in a hole drilled in the same tappet.  It was simple, precise and effective and reliably delivered such power that even Enzo Ferrari (1898-1988) considered matters desmodromic, discussing the matter with Dr Fabio Taglioni (1920-2001) who was working on the idea, his design first used by Ducati in 1954 on their 125 cm³ (7.6 cubic inch) racer and later adopted for many of their production and competition machines, used even to this day. 

Lindsay Lohan with Ducati Monster 600 (Desmodromic) in Freaky Friday (2003).

Not needing return springs, the valves being positively opened and closed by a cam and leverage system, desmodromic offered higher engine speed, more power and a variety of improvements to specific efficiencies.  Despite that, except for Ducati, it never became a system used by volume manufacturers (or indeed low-volume operations) because of the disadvantages which included complexity, cost, noise (especially as the cylinder count grew) and, critically, more frequent maintenance.  It was advances in high-speed photography and later computer analysis which rendered desmodromic an engineering cul-de-sac.  With a frame-by-frame view of how valves and valve springs behaved, designers were able to engineer solutions to the problems previously though inherent to conventional valve-trains and, by the 1980s, vastly more powerful computers permitted the virtual testing of every design permutation.  Eventually, the advantages offered by desmodromics became so small that few attempted to justify to additional cost and maintenance penalty.

2002 Ducati MH900e (desmodromic).

What the photography revealed was that valve float was caused mostly by resonance in the springs which generated oscillating compression waves among the coils and that at specific resonant speeds, the springs were no longer making contact at one or both ends, leaving the valve “floating” before crashing into the cam on closure.  The solutions were varied and some, such as Norton's “mousetrap” or “hairpin” spring were soon discarded because, although they worked well, the engineering challenges in integrating them with existing combustion chamber designs created as many problems as were solved.  A less elegant but more manageable approach was to install as many as three concentric valve springs, sometimes nested inside one other; not for more force (the inner ones having no significant spring constant), but to act as dampers, both absorbing and reduce oscillations in the outer spring (engineers delighting in calling the additional springs “snubbers”).  Again, the advances in metallurgy made possible what was once though unattainable.  Complex valve springs were engineered which did not resonate, being progressively wound with a varying pitch varying diameter and dubbed “beehive springs” because of the shape.  The number of active coils in these springs would vary during the stroke, the more closely wound coils located at the static end, becoming inactive as the spring compressed or (as in the beehive) where the small diameter coils at the top were stiffer.  Thus valve float was conquered with springs.

2023 Ducati Multistrada V4, the first Ducati in decades to use conventional valve activation.

But Ducati persists to this day, their raucous machines, once a cult known to a few now enjoying a wider audience which seems prepared to accept both the frequency of with which valve-train adjustments are required and the inherent clatter (which is admittedly quite spine-tingling if sampled at speed when wearing a crash helmet).  Tellingly, Ducati’s motor-cycles are almost all V-twins because the noise level does become intrusive as the cylinder count increases and their recent Multistrada V4 was the first in decades to not use desmodromic valves, the owner rewarded, inter alia, with recommended maintenance intervals of 60,000 km (37,500 miles), a considerable advance on the traditional 12-18,000 km (7500-11,200 miles).  Advances in engineering techniques have allowed the noise of the desmodromic arrangement to be reduced and there are now four-cylinder Ducatis using the system, appealing to those who lust for top end power.  Among collectors of US muscle cars, Ferraris, Jaguars and such there are those who can think of no more pleasurable way to spend a day than adjusting solid valve lifters or tinkering with an array of carburettors (the fascination of intricacy its own reward), the synchronization of which defy all but the chosen priesthood of such things so Ducati seems likely to offer the devoted their desmodromics as long as such things remain somewhere lawful.

Pontoon

Pontoon (pronounced pon-toon)

(1) In military use, a boat, boat-like device or some other floating structure used as one of the supports for a temporary bridge (often styled as “pontoon bridge) placed over a river, canal or similar waterway.

(2) A float for a derrick, landing stage etc.

(3) In nautical use, a float (often inflatable) for raising a sunken or deeply laden vessel in the water; a camel or caisson.

(4) In aviation, a seaplane’s floats.

(5) In some places (1) an alternative name for the card game blackjack (also as 21 or twenty-one, an alteration of the French ving-un (an obsolete variant of vingt-et-un (twenty-one)) and (2) in the game, the combination of an ace with a ten or court card when dealt to a player as his first two cards.

(6) In nautical freight & passenger handling, a lighter or barge used for loading or unloading ships.

(7) In automotive design, a style in which the coachwork features smooth, flowing curves extending from the front to the rear without interruption.

1585–1595: From the Middle French ponton, from the fourteenth century Old French ponton (bridge, drawbridge, boat-bridge; flat-bottomed boat), from the Latin pontōn-, from pontō (flat-bottomed boat, punt), from pōns (bridge); a pontōnem was a “ferryboat”.  The use in some places to describe the card game (an alteration of the French ving-un (an obsolete variant of vingt-et-un (twenty-one) dates from 1916 and entered English when French & British troops played the game on the Western Front during World War I (1914-1918).  In engineering, the pontoon bridge (a roadway supported on pontoons) was described as early as 1778.  Pontoon, pontooning & pontooneer are nouns and pontooned is an adjective & verb; the noun plural is pontoons.

Bugatti T32s at the French Grand Prix, Tours, 1923.

Attracted by gains to be realized in aerodynamic efficiency, in 1923 Bugatti fabricated four T32 race cars to compete in that year’s French Grand Prix using the pontoon principle.  Bodied in aluminum, the stubby little machines were nicknamed “the Tanks” and there’s certainly a resemblance to the lines of the World War I tanks but, designed without the use of a wind-tunnel, the aviation influenced airfoil shape chosen to increase top speed also possessed that other quality need by aircraft: lift.  The combination of speed and lift was of course a recipe for instability and the T32s showed a marked inclination to leave the track.  Despite this discouraging start, the pontoon approach would ultimately prevail but for decades, instances of aerodynamically-induced instability would plague the tracks, the death toll not small.

Small & large: 1926 Hanomag 2/10 PS Coupé (Kommissbrot) (left) & 1933 Volvo Venus Bilo (right).  The larger the pontoon, the more slab-sided the tendency.

In automotive design, term "pontoon" was used to a style in which the coachwork features smooth, flowing curves extending from the front to the rear without interruption.  The use of the word alluded to the nautical term used to describe a floatation device attached to the sides of a boat or ship to provide stability.  The objectives of the early adopters of the motif included (1) aerodynamic efficiency, (2) a reduction in the number of components needed to form a body, (3) enhanced efficiency through the allocation of more usable internal space and (4) a sleek and streamlined appearance.  It took decades of experimentation and there were a number of notable failures in just about every aspect of the pursuit of those objectives but, beginning in the 1920s, literally dozens of recognizably pontoon-like forms entered production, some sold by the thousand but it’s notable the most successful ventures were those which involved smaller (sometimes on the scale which would later be called micro-cars) vehicles.  On those, the styling tended to be less jarring to the aesthetic sensibilities of those who would actually pay for the things; on the larger machines, the most commonly applied epithet was “slab-sided”.

The pontoon would prevail but in one little corner of England, the 1930s lasted until 1968.  Remarkably, when the NSU Ro80 (left) was released in 1967, the Vanden Plas Limousine (right, complete with a divided windscreen made of two flat panes) was on-sale in a showroom in the same street.

Still, as the 1930s unfolded, the trend was certainly gaining strength and had it not been for the blast of war, things might have evolved much as they did although like many of the aspects of science and engineering which benefited from the extraordinary progress realized during those years, the evolution at the very least would probably have taken much longer.  As it happened, in the late 1940s as the first generation of post-war vehicles was released in the US, the pontoon motif was almost universal, only some vestigial traces of the old, separated ways remaining to reassure.  In Europe, some clung longer to the old ways and in the UK, even by the late 1960s there were still traditionalists finding a tiny market still existed for the old ways bit but mostly, during the previous decade the pontoon had taken its place as one of the symbols of mid century modernism.

Bridge on the road to the pontoon: 1948 Mercedes-Benz 170 (left) & 1951 Mercedes-Benz 220 (right).

One range was so definitively pontoonish that it even picked up the nickname “pontoon”.  Daimler-Benz emerged from World War II not so much diminished as almost destroyed and in 1945 the board of directors felt compelled to issue a statement declaring “Daimler-Benz had ceased to exist in 1945” although that proved pessimistic, a modest programme of repair and maintenance soon established and the next year, small scale production resumed of the pre-war 170V although circumstances were challenging and in two years barely 600 left the improvised assembly line.  However, the currency reform and economic stabilization of 1948 transformed things and marked the birth of the post-war Wirtschaftswunder (economic miracle) and the 170 range, so appropriate to the austere times was soon augmented and then replaced by more advanced models but the pre-war styling was carried over substantially unchanged.

The Mercedes-Benz Pontoons: 1953 180 (left), 1956 219 (centre) and 1959 220 SE cabriolet (right).

Lindsay Lohan on pontoon, Sardinia, 2016.

It was however obvious that the approach was antiquated and in 1951 work was begun on a new range of mass-produced four-door sedans which abandoned the old separate chassis for a unibody.  This was the car which came to be called the pontoon and the first version was released in 1953 as the 180, fitted with 1.8 litre (110 cubic inch) four-cylinder engine in both petrol & diesel forms.  Stylistically, it was among the simplest, least adorned interpretations of the pontoon idea and has been compared both to “three boxes” and “on loaf of bread atop another” and among mainstream vehicles, probably only the contemporary British Fords (the Mark Consul, Zephyr & Zodiac (the so called “three graces”)) enjoyed the same austerity of line.  The pontoon though looked undeniably modern compared with its predecessors and it was a success, soon augmented by the longer 220 fitted with the 2.2 litre (134 cubic inch) straight-six with which more than any other the company rebuilt its reputation.  As the Wirtschaftswunder gathered pace, demand emerged for something more exclusive and a 220 coupé and cabriolet were added although, very expensive, production didn’t reach far into four figures.  More popular was the blend of the six cylinder engine with the short body of the 180, the engineering of which was simple enough but finding the appropriate nomenclature must have required some discussion and, given the way thing were then done by Germans, presumably reached board level for approval.  The solution was to call it the 219 which was a unique departure from the factory’s naming conventions and the only time in recent history the base three-digit model designation has ended in other than a 0 (zero).  Model proliferation would follow and the problem would reoccur and in later years another convention was adopted which lead to a confusing alpha-numeric soup (190 E 2.6, 300 E 2.8 etc so under that regime the 219 would have become the 180 2.2) until in the early 1990s the whole system was re-organized.  The pontoon line lasted until 1963 although by then it looked a relic and had been cut to a few lower-cost utilitarian models.  The pontoons were really the last memory of the austere years before the exuberance of the 1960s affected even Daimler-Benz.

OSI Silver Fox.  Race car designers had before tried the twin-pontoon idea without great success but in 1967, attracted by the uniquely achievable aerodynamic advantages offered by what was essentially a “wing with wheels”, OSI built the Silver Fox for the Le Mans 24 Hour endurance race.  Financial difficulties doomed that project and the potential of concept was undermined when the Fédération Internationale de l'Automobile (the FIA; the International Automobile Federation (and international sports dopiest regulatory body)) banned “movable aerodynamic aids”).

Sponson

Sponson (pronounced spon-suhn)

(1) In naval architecture, a structure projecting from the side or main deck of a vessel to support a gun or the outer edge of a paddle box.

(2) In nautical design, (1) a buoyant appendage at the gunwale of a canoe to resist capsizing, (2) a structural projection from the side of a paddle steamer for supporting a paddle wheel and (3) a float or flotation chamber along the gunwale of a boat or ship

(3) In aeronautics, (1) a protuberance at the side of a flying-boat hull, designed to increase lateral stability in the water or (2) a structural unit attached to a helicopter fuselage by fixed struts, housing the main landing gear and inflatable flotation bags.

(4) A semi-circular gun turret on the side of a tank.

1825–1835: Origin unknown but thought a variant of expansion, most likely a form of imperfect echoic related to the regional accents of workers in ship-building yards.  The first sponsons were the platforms on each side of a steamer's paddle wheels.  Sponson is a noun (and curiously so is sponsing because it's an alternative spelling), sponsoning & sponsoned are verbs.  All subsequent derivations are based on the original nautical form. 

Boeing 314 Clipper cutaway.

Re-using some of an earlier design for a bomber which failed to meet the military’s performance criteria, between 1938-1941, Boeing built twelve 314 Clippers, long-range flying boats with the range to cross both the Atlantic and Pacific oceans.  Although used by the military during World War II, most of their service was with the two commercial operators Pan Am (Pan-American Airways) and BOAC (British Overseas Airways Corporation).  Very much a machine of the pre-war age, the last Clippers were retired from service between 1946-1948, the advances in aviation and ground infrastructure built during war-time rendering them obsolete and too expensive to maintain.

Passengers boarding Boeing 314 Clipper via port-side sponson.

The sponsons built into the hull structure at the waterline were multi-functional.  They provided (1) a gangway for passengers and crew boarding and departing, (2) a stabilizing platform for the craft while moored or at anchor, (3) were an integral part of the aerodynamics, providing additional lift and thus were a kind of mini-wing al la the biplane and (4) served as auxiliary fuel tanks, the craft carrying some 4,500 gallons (20,460 litres) of aviation spirit.

Lindsay Lohan ascending ladder attached to a yacht's sponson while off the Sardinian coast, July 2016.  Because of the proximity to the water's surface, sponsons are often used for purposes such as ladders and mooring points for dinghies.

On watercraft, a sponson is an architectural feature extending from the hull or other part of the superstructure to aid in stability while floating or as a securing point for equipment.  Sponsons add stability when underway or at rest but some designs, notably those on high-performance craft, are there to make possible sharper changes of direction as they “dig in” (which is probably not the best phrase to use) to the water on the inside of the turn.  On some vessels, sponsons can even be essential to ensure seaworthiness because they can be used to provide additional buoyancy.  In some specialized applications (notably those designed for canals or other internal waterways) there are hull designs which actually wouldn’t float unless fitted with sponsons.  Sponsons can be designed to act as a protective barrier, shielding main hull from damage.  Essentially, this is a structural version of the car tyres often seen strung over the sides of vessels, a useful precaution to prevent damage which might be caused during low-speed docking manoeuvres such as docking.  It may sound an extreme approach but it’s almost always easier & cheaper to repair or replace a sponson than a hull.  When moored, large sponsons can also be used as an ad-hoc addition to deck space and it’s not unusual for them to be used as diving platforms or places from which to fish.

Purgatory

Purgatory (pronounced pur-guh-tree (U), pur-guh-tawr-ee (non-U) or pur-guh-tohr-ee (non-U)

(1) In the orthodox theology of the Roman Catholic Church (and in some other Christian denominations), a condition or place in which the souls of those dying penitent (in a state of grace) are purified from venial sins, or undergo the temporal punishment that, after the guilt of mortal sin has been remitted, still remains to be endured by the sinner.

(2) In the Italian Purgatorio (pronounced poor-gah-taw-ryaw), the second part of Dante's (Dante Alighieri (circa 1265–1321)) Divine Comedy (1320), in which repentant sinners are depicted.

(3) Any condition or place of temporary punishment, suffering, expiation, or the like; any place of suffering, usually for past misdeeds.

(4) Serving to cleanse, purify, or expiate.

1160-1180: From the Middle English purgatorie (place or condition of temporal punishment for spiritual cleansing after death of souls dying penitent and destined ultimately for Heaven), from the Old French purgatore & purgatorie, from the Medieval Latin pūrgātōrium (means of cleaning), noun use of neuter of the Late Latin pūrgātōrius (purging, literally “place of clensing”), the construct being pūrgā(re) (to purge) + -tōrius (-tory), the adjectival suffix, from purgat-, past-participle stem of pūrgāre (to purge, cleanse, purify).  The adjectival form developed in the late thirteenth century, independent of the evolution in Church Latin.  The figurative use (state of mental or emotional suffering, expiation etc) dates from the late fourteenth century, originally used poetically especially despairingly when speaking of unrequited love, or (and this may seem a paradox to same and merely descriptive to others), of marriage.   In old New England it was used of narrow gorges and steep-sided ravines, a reference to the difficulties to be dad when negotiating such terrain.  Purgatory, purgatorium & purgatorian are nouns and purgatorial is an adjective; the noun plural is purgatories.

Mankind's Eternal Dilemma: The Choice Between Virtue and Vice (1633) by Frans Francken the Younger (1581–1642), Museum of Fine Arts (MFA), Boston.

In the teachings of the Roman Catholic Church, the purgatory is the condition of souls of the dead who die with punishment but not damnation due them for their sins committed on Earth.  Purgatory is conceived as a condition of suffering and purification that leads to union with God in heaven and is something thus inherently temporary and has always been a bit of a theological problem because it’s not mentioned (or even alluded to) in the Bible.  The usual rationalization of this scriptural lacuna is the argument that prayer for the dead is an ancient practice of Christianity and one which has always assumed the dead can be in a state of suffering, something which the living can improve by their prayers.  Theological positions have hung on thinner strands than that and within Roman Catholicism, purgatory has never attracted the controversy which so excited critics of limbo, a rather more obviously unjust medieval conjecture, but many branches of Western Christianity, notably the Protestant tradition, deny its existence although among the more ritualistic, there are those who conceive purgatory as a place and one often depicted as filled with fire.  The transitory nature of the condition has often encouraged misunderstanding for it is not a place of probation; the ultimate salvation of those in purgatory assured, the impenitent not received into purgatory.  Instead, the souls in purgatory receive relief through the prayers of the faithful and through the sacrifice of the mass, the confusion perhaps arising from the imagining the destructive nature of fire on Earth whereas upon the soul with no earthly attachment, it can be only cleansing.

So purgatory is the state of those who die in God's grace but are not yet perfectly purified; they are guaranteed eternal salvation but must undergo purification after death to gain the holiness needed to enter heaven.  The purgatory, the framework of which was fully developed at the Councils of Florence (1431-1449) and Trent (1545 and 1563), is totally different from the punishment of the damned who are subject to a cleansing fire, the scriptural explanation being "The person will be saved, but only through fire" (1 Corinthians 3:15) but even then the Church recognized degrees of sin as Pope Gregory I (Saint Gregory the Great, circa 540–604; pope 590-604) helpfully clarified: "As for certain lesser faults, there is a purifying fire."  The possibilities were made explicit during the Council of Trent in the statement “God predestines no one to hell” which made clear that damnation is visited upon sinners only by a persistence in mortal sin until death and God would much prefer "all to come to repentance" (2 Peter 3:9).   In the Roman ritual, the relevant line is "save us from final damnation and count us among those you have chosen" and through purgatory, souls "achieve the holiness necessary to enter the joy of heaven".  Mortal sin incurs both temporal punishment and eternal punishment, venial sin ("forgivable sin” in this context) incurs only temporal punishment. The Catholic Church makes a distinction between the two.

Dante and Virgil Entering Purgatory (1499-1502) by Luca Signorelli (circa 1444-1523), Chapel of San Brizio, Duomo, Orvieto, Italy.  The pair are shown in the first terrace watching souls of the prideful being made to cat stones on their backs.

The noun purgatory appeared perhaps between 1160 and 1180, giving rise to the idea of purgatory as a place but the Roman Catholic tradition of purgatory as a transitional condition has a history that pre-dates even the birth of Christ.  There was, around the world, a widespread practice of both caring for and praying for the dead, the idea that prayer contributed to their purification in the afterlife.  Anthropologists note the ritual practices in other traditions, such as the way medieval Chinese Buddhists would make offerings on behalf of the dead, said to suffer numerous trials so there is nothing novel in the practice which is mentioned in what the Roman Catholic Church has declared to be part of Sacred Scripture, and which was adopted by Christians from the beginning, a practice that pre-supposes that the dead are thereby assisted between death and their entry into their final and eternal abode.

Whether purgatory is actually a place has in Roman circles been discussed for centuries.  In 2011 Pope Benedict XVI (b 1927; pope 2005-2013, pope emeritus since), speaking of Saint Catherine of Genoa (1447–1510), said that in her time the purgatory was pictured as a location in space, but that she saw it as a purifying inner fire, such as she experienced in her profound sorrow for sins committed, such a contrast with God's infinite love.  The failing of man she said was being bound to the desires and suffering that derive from sin and that makes it impossible for the soul to enjoy the beatific vision of God.  Noting that little appeared to have changed, Benedict noted "We too feel how distant we are, how full we are of so many things that we cannot see God. The soul is aware of the immense love and perfect justice of God and consequently suffers for having failed to respond in a correct and perfect way to this love; and love for God itself becomes a flame, love itself cleanses it from the residue of sin."

The Eastern Catholic Churches are Catholic churches sui iuris of Eastern tradition, (in full communion with the Pope) but there are some differences with Rome on aspects of purgatory, mostly relating to terminology and speculation.  The Eastern Catholic Churches of Greek tradition do not generally use the word "purgatory", but agree that there is a "final purification" for souls destined for heaven and that prayers can help the dead who are in that state of "final purification".  In neither east nor west are these matters thought substantive and are regarded as nuances and differences of tradition.  The Eastern Catholic Churches belonging to the Syriac Tradition (Chaldean, Maronite and Syriac Catholic), generally believe in the concept of Purgatory but use a different name (usually Sheol) and claim there is contradiction with the Latin-Catholic doctrine.  Rome appears never to have pursued the matter.

La Divina Commedia di Dante (Dante and His Poem), oil on canvas by Domenico di Michelino  (1417–1491) after Alesso Baldovinetti  (1425–1499), collection of Florence Cathedral, Italy.  This work, in depicting the seven terraces in the form of the mountain were one approach to Dante's Purgatory, the other a focus on one level. 

The Eastern Orthodox Church rejects the term "purgatory" but does admit an intermediate state after death, the determination of Heaven and Hell being stated in the Bible and it notes prayer for the dead is necessary.  The position of Constantinople and environs is that the moral progress of the soul, for better or worse, ends at the very moment of the separation of body and soul; it is in that instant the definite destiny of the soul in the everlasting life is decided.  There is no way of repentance, no way of escape, no reincarnation and no help from the outside world, the eternal place of the soul decided forever by its Creator and judge.  Thus the Orthodox position is that while all undergo judgment upon death, neither the just nor the wicked attain the final state of bliss or punishment before the last day, the obvious exception being the righteous soul of the Theotokos (the Blessed Virgin Mary), "who was borne by the angels directly to heaven".

Generally, Protestant churches reject the doctrine of purgatory although more than one Archbishop of Canterbury may have come to regard Lambeth Palace as Purgatory on Earth.  One of Protestantism's most cited tenets is sola scriptura (scripture alone) and because the Bible (from which Protestants exclude deuterocanonical books such as 2 Maccabees) contains no obvious mention of purgatory, it’s therefore rejected as an unbiblical and thus un-Christian.  There are however variations such as the doctrine of sola fide (by faith alone) which hold that pure faith, apart from any action, is what achieves salvation, and that good deeds are but mere manifestations of that faith so salvation is a discrete event that takes place once for all during one's lifetime, not the result of a transformation of character.  What does seem to complicate that is that most Protestant teaching is that a transformation of character naturally follows the salvation experience; instead of distinguishing between mortal and venial sins, Protestants believe that one's faith dictates one's state of salvation and one's place in the afterlife, those saved by God destined for heaven, those not excluded.  Purgatory is thus impossible.

Divina Commedia, Purgatorio (circa 1478), illuminated manuscript commissioned by Federico da Montefeltro (1422–1482), Vatican Library collection, Rome.  Again, the carring of stones on the first terrace, the style is recognizable in the later schools of mannerism and surrealism.  

Wishing to excise any hint of popery from religion, purgatory was addressed in two of the foundation documents of Anglicanism in the sixteenth century.  Prayers for the departed were deleted in the 1552 revision to the 1549 Book of Common Prayer because they implied a doctrine of purgatory (it was the nineteenth century Anglo-Catholic that saw them restored to some editions) and Article XXII of the the Thirty-Nine Articles of Religion (1571) was most explicit: "The Romish Doctrine concerning Purgatory . . . is a fond thing, vainly invented, and grounded upon no warranty of Scripture, but rather repugnant to the Word of God."  In the twenty-first century, the Anglicans, finding it hard to sit anywhere but on the fence, now say “Purgatory is seldom mentioned in Anglican descriptions or speculations concerning life after death, although many Anglicans believe in a continuing process of growth and development after death.”  The post-modern church writ small; one wonders if the PowerPoint slides of Anglican accountants and Anglican theologians greatly differ.

In Judaism, Gehenna is a place of purification where, according to some traditions, sinners spend up to a year before release.  For some, there are three classes of souls: (1) the righteous who shall at once be written down for the life everlasting, (2) the wicked who shall be damned and (3), those whose virtues and sins counterbalance one another shall go down to Gehenna and float up and down until they rise purified.  Other sects speak only of the good and the bad yet, confusingly, most also mention an intermediate state.  There’s also variance between the traditions regarding the time which purgatory in Gehenna lasts, some saying twelve months and others forty-nine days, both opinions based upon Isaiah 66:23–24: "From one new moon to another and from one Sabbath to another shall all flesh come to worship before Me, and they shall go forth and look upon the carcasses of the men that have transgressed against Me; for their worm shall not die, neither shall their fire be quenched"; the former interpreting the words "from one new moon to another" to signify all the months of a year; the latter interpreting the words "from one Sabbath to another", in accordance with Leviticus 23:15-16, to signify seven weeks.  Whatever the specified duration, there are exceptions made for the souls of the impure which prove resistant to the persuasions of the Gehenna.  According to the Baraita (a Jewish oral law tradition), the souls of the wicked are judged, and after these twelve months are are consumed and transformed into ashes under the feet of the righteous whereas the "great seducers and blasphemers" are to undergo eternal tortures in Gehenna without cessation.  The righteous however and, according to some, also the sinners among the people of Israel for whom Abraham intercedes because they bear the Abrahamic sign of the covenant, are not harmed by the fire of Gehenna even when they are required to pass through the intermediate state of purgatory.

Relief sculpture on a side wall at the Chapel of Souls, (Capilla de Animas) in Compostela, Spain.  These are the souls of the lustful on the seventh terrace, praying for release, which they have been promised will (eventually) be granted by the cleansing flames, something dependent on true repentance.

It was the Florentine poet Dante (Dante Alighieri, circa 1265–1321) who, in the second cantica of the epic poem Divine Comedy (1320) gave the world a vivid depiction of the place he called Purgatorio.  Dante described Purgatory as a mountain which rose on the far side of the world, opposite Jerusalem, with seven terraces, each corresponding to the one of the seven deadly sins, each terrace a place of purification for souls who are penitent and seeking to cleanse themselves of their sins, so to be judged worthy of entering Paradise.  In the valley at the base of the mountain is Ante-Purgatory and here sit the souls of the excommunicated and those who delayed repentance (the so called the “late repentant”) as they await their turn to begin their ascent of the terraces.  Throughout Purgatory, angels and guides assist the souls and Dante's guide is the Roman poet Virgil (symbolizing human reason).  Virgil leads Dante until they reach Earthly Paradise where Beatrice (representing divine wisdom) takes over as the guide to Heaven.

The seven terraces

First Terrace (Pride): Here the souls are humbled by being made to carry heavy stones on their backs, forcing them to bend and contemplate humility.

Second Terrace (Envy): Envious souls are punished by having their eyes sewn shut with twists of iron wire so they may learn to appreciate the beauty of charity and generosity.

Third Terrace (Wrath): Souls of the wrathful Souls enveloped in a thick smoke that blinds them, teaching them to cultivate patience and peace.

Fourth Terrace (Sloth): The slothful are punished by being forced incessantly to run, encouraging diligence and zeal.

Fifth Terrace (Avarice and Prodigality): These souls have to lie face down in the dirt and weep, teaching them to balance their desire for material wealth with the virtues of generosity and moderation.

Sixth Terrace (Gluttony): The gluttonous are starved so extreme hunger and thirst constantly will remind them of the importance of temperance.

Seventh Terrace (Lust): Souls here walk through walls of flames, purging the sin of lust, teaching chastity and love for God.

Lindsay Lohan and her lawyer in court, Los Angeles, December 2011.

That all sound rather grim but at the mountain’s summit sits the reward: Earthly Paradise (the Garden of Eden).  Here, in this place of peace and beauty, symbolizing the restored innocence and grace, souls are purified completely and ready to ascend to Heaven.  So, the purpose of Dante's Purgatory is less the punishments which must be endured than the possibility of redemption from sin through repentance to purification, leading ultimately to the soul's readiness for Paradise. In this it contrasts with the eternal sufferings which are the fate of those souls condemned to the circles of Hell.