Dome

Dome (pronounced dohm)

(1) In architecture, a vault, having a circular plan and usually in the form of a portion of a sphere, so constructed as to exert an equal thrust in all directions.

(2) A domical roof or ceiling; a polygonal vault, ceiling, or roof.

(3) Any covering thought to resemble the hemispherical vault of a building or room; anything shaped like a hemisphere or inverted bowl.

(4) In water management, (usually in dam design), a semidome having its convex surface toward the impounded water.

(5) In crystallography, a form having planes that intersect the vertical axis and are parallel to one of the lateral axes.

(6) In geology, an upwarp (a broad anticline (a fold with strata sloping downwards on each side) caused by local uplift).

(7) In geology, a mountain peak having a rounded summit (a structure in which rock layers slope away in all directions from a central point).

(8) As vistadome, in passenger vehicles (usually railroad cars), a raised, glass-enclosed section of the roof of, placed over an elevated section of seats to afford passengers a full view of scenery (not usually truly in the hemispherical shape of a dome).

(9) In horology, the inner cover for the works of a watch which snaps into the rim of the case.

(10) A building; a house; an edifice (obsolete except as a literary device).

(11) As heat dome, a meteorological phenomenon in which the interplay of high & low pressure atmospheric systems interact to produce static, warm air over a large area.

(12) To cover with or as if with a dome; to shape like a dome.

(13) To rise or swell as a dome.

(14) In slang, a person's head (the form chrome dome used of the bald).

(15) In slang (both military and in some criminal classes), to shoot in the head (often in the form “got domed”).

(16) In African-American slang, to perform fellatio upon.

1505–1515: From the Middle French domme & dome (a town-house; a dome, a cupola) (which persists in modern French as dôme), from the Provençal doma, from the Italian duomo (cathedral), from the Medieval Latin domus (ecclesiae; literally “house (of the church)”), a calque of the Ancient Greek οἶκος τῆς ἐκκλησίας (oîkos tês ekklēsías).  Dome is a noun & verb, domed & doming are verbs and domelike, domical, domish & domesque are adjectives; the noun plural is domes.

By the 1650s, the formalized use in architecture ensured the meaning was (more or less) standardized as “a round, vaulted roof, a hemispherical covering of a building” and thus the ultimate specialized evolution from the Greek dōma (a house, housetop (used especially of those with a roof “in the eastern style”), from domos (house), from the primitive Indo-European root dem- (house, household).  The medieval use of the German dom and Italian duomo as verbal shorthand for “cathedral” (essentially a clipping from “house of God”) was picked up in the imperfect way so many words entered English to describe architectural features in the style of hemispherical cupolas, the domes at the intersection of the nave and the transept, or over the sanctuary, characteristic architectural feature of Italian cathedrals.  The sense in English of “a building, a house” had been borrowed in English as early as the 1510s and was used mostly of stately homes and it endures but only as a literary device and it’s rarely seen outside of poetry.

The shape occurs to one degree or another in nature and is common in man-made objects and the built environment so dome is an often seen modifier (cake dome, pleasure dome, lava dome; onion dome et al) and appears in the opening lines of one of the most cherished fragments of English verse: Kubla Khan (1797) by Samuel Taylor Coleridge (1772-1834).

In Xanadu did Kubla Khan
A stately pleasure-dome decree:
Where Alph, the sacred river, ran
Through caverns measureless to man
Down to a sunless sea.

Some of the use has also been opportunistic and not especially domical.  Vistadomes were raised, glass-enclosed sections built into the roofs of railway carriages, placed over an elevated section of seats to afford passengers a better view of the scenery.  The idea was picked up by General Motors, the Oldsmobile Vista Cruiser station wagon (1964-1977), the Buick Roadmaster Estate (1991-1996) and the Scenicruiser busses (1954-1956 and made famous in the Greyhound livery some wore until the 1970s) all used raised, partially-windowed sections although none were officially described as “domes”.

The Hagia Sophia, now the main mosque in Istanbul; the minarets were added after the fall of Constantinople to the Ottoman Turks in 1453 and there are many architectural critics who maintain visually they improve the balance of the structure.  The illustration on the right shows how the Byzantine engineers used pendentives to make the construction of domes possible.     

Domes however are most associated with grand-scale, representational architecture (although quite a few builders of McMansions found them hard to resist).  One intriguing aspect of structural engineering upon which the integrity of a dome depends on what are called pendentives (the triangular segments of the lower part of a hemispherical dome left by the penetration of the dome by two semicircular vaults intersection at right angles).  Dating from 1727, pendentive was from the mid-sixteenth century French pendentif, from the Latin pendentem (nominative pendens) (hanging and the source of the English “pendulous”), the present participle of pendere (to hang) from the primitive Indo-European roots pen & spen- (to draw, stretch, spin).  What pendentives permit is the use of a circular dome over a square void square room or an elliptical one over something rectangular room.  Pendentives, (geometrically the triangular segments of a sphere), taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base as required.  As structural supports, pendentives distribute the bulk of a dome’s weight to the four corners (the strongest points) and ultimately to the piers and the foundations below.  The classic example is the Hagia Sophia, the sixth century Byzantine cathedral at Constantinople (modern day Istanbul).  It was converted into a mosque when Constantinople fell to the Ottoman Turks in 1453 and, after a century-odd as a museum, is again a mosque.

Scale model of Germania.  Hitler would spend hours pondering the details but in 1945, he spent even longer looking at the model of what was planned for the Austrian city of Linz where he'd decided to have his tomb installed.

Domes have long been a favorite of emperors, dictators and those other megalomaniacs: architects.  A truly monumental one would have been the Volkshalle (People's Hall and known also as the Große Halle (Great Hall) & Ruhmeshalle (Hall of Glory), the centerpiece of Adolf Hitler’s (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) never realized plan to re-built Berlin as Germania, a worthy Welthauptstadt (world capital) of his “thousand year Reich”.  Although Albert Speer (1905–1981; Nazi court architect 1934-1942; Nazi minister of armaments and war production 1942-1945) was Germania’s chief architect, in some aspects he was really a glorified draftsman, correcting the technical errors in the drawings passed to him by the Führer who had be sketching parts of the design since the early 1920s.

Even by the standards of the super-dimensionality which was characteristic of the Third Reich, the domed hall would have been extraordinary.  The oculus would have been 46 m (151 feet) in diameter which would have accommodated the entire rotunda of Hadrian's Pantheon and the dome of St Peter's Basilica.  The  250 m (820 feet) diameter of the dome was (and this was a signature of Speer’s approach), bigger even than Hitler had requested and he was much displeased to learn of a rival architect’s plans for a dome 15 m (49 feet) greater in diameter to sit atop the city’s new railway station.  As things turned out, none of the grandiose structures were ever built and although a tinge of regret can be found in Speer’s post-war thoughts, even he admitted the designs were a failure because of “their lack of human scale”.

Berlin's rebuilt Reichstag with steel & glass dome.

Berlin did however eventually get a new dome, albeit it one rendered not in granite but the glass and steel the Führer thought was fine for factories and warehouses but which would have appalled him as a method of construction for public, representational architecture.  Plonked atop the rebuilt Reichstag, it was said to symbolize the reunification of Germany although quite how it managed that has never really been explained although the distinctive structure has become a city landmark and people seem to like it.  A clever design, it sits directly above the chamber of the Bundestag (the lower house of the bicameral federal parliament) and permits public observation, the clever design also reducing energy use by optimizing the input of natural light while moving shrouds minimize glare and heat-soak.

Cinerama Dome, Los Angeles in 1965, the year of its greatest commercial success.

The Cinerama Dome movie theatre sits on Hollywood’s Sunset Boulevard.  Opened in 1963, the Cinerama Dome introduced a new concept for film projection, a curved screen which sat inside a geodesic dome based on the design developed by US systems theorist & architect Richard Buckminster Fuller (1895–1983), one attraction of which was such things could be built at lower coast and in much less time than a conventional theatre building.  Intended to be the first of perhaps thousands around the planet, it was built in a still remarkable four months but it remains the only concrete geodesic on the planet and while it has operated intermittently since being closed during the COVID-19 pandemic, its future is uncertain and although it will probably be preserved as a historic building, it’s likely to be re-purposed as retail or restaurant space.

Lindsay Lohan at the Scary Movie V premiere, Cinerama Dome, April 2013.

The end of the line for Cinerama is another marker in the evolution of the technology which underpinned the evolution of the US economy from one based on agriculture, to one increasingly industrial to one geared around the military & entertainment.  In the 1950s, cinema’s greatest challenge came from television and the film studios fought back by creating differentiation in their products.  The venture into 3D proved a cul-de-sac for a number of reasons but one thing cinemas could do was make their big screens huge and during the 1950s the wide-screen Cinemascope enjoyed a boom.  However, there was a limit to how much screens could grow, hence the interest in Cinerama which projected onto a curved screen designed to take advantage of the way the human eye sees and processes images, the system at its best when provided by three synchronized projectors.  The idea lives on in the curved screens which have become popular among gaming freaks who enjoy the sense of “envelopment”.  It was also the era during which populations moved further from city centres into suburbs and thus, cinemas also needed to move, more of which (but often smaller) would be required.  Thus the attraction of the geodesic dome came which, largely pre-fabricated, was cheap to produce and quick to assemble.  However, Cinerama was expensive to film, to print, to produce and the sheer size and weight of the prints meant it was costly even to ship the material to venues and the conversion process to something which could be used with conventional projection.

Heat Domes

July 2023 Global heat map from the Climate Change Institute, University of Maine, USA.  For those unconvinced, Fox News continues to provide alternative facts.

The “heat dome” is a weather phenomenon, the physics of which has for decades been understood but of late the term has entered general use as much of the northern hemisphere has suffered from prolonged, unusually high temperatures, July 2023 measured as the hottest month ever recorded.  A heat dome occurs when a large, high-pressure system traps and concentrates hot air in a specific region, leading to prolonged and extremely high temperatures. Under a heat dome, the atmospheric pressure aloft prevents the hot air from rising and dissipating, effectively acting as a lid or cap over the area, thus the image of a dome sitting over the land.

The UK's Royal Meteorological Service's simple illustration of the physics of a heat dome.  Heat domes are also their own feedback loop.  A static areas of high pressure which already contains warm or hot air trapped under the high will become hotter and hotter, creating a heat dome.  Hot air will rise into the atmosphere, but high pressure acts as a lid and causes the air to subside or sink; as the air sinks, it warms by compression, and the heat builds. The ground also warms, losing moisture and making it easier to heat even more.

Cupola

Cupola (pronounced kyoo-puh-luh)

(1) In architecture, a light structure on a dome or roof, serving as a belfry, lantern, or belvedere (some functional, some merely ornamental).

(2) Any of various dome-like structures (especially in architecture or one covering a circular or polygonal area).

(3) In naval architecture, a protective dome for guns on a warship

(4) In armored vehicles, a raised structure with a narrow aperture for viewing, sometimes fitted with a gun or flame-thrower.

(5) In geology, an upward-projecting mass of plutonic rock extending from a larger batholith.

(6) In metallurgy, a vertical, air-blown coke-fired cylindrical furnace in which iron is re-melted for use in casting.

(7) In geometry, a solid formed by joining two polygons, one (the base) with twice as many edges as the other, by an alternating band of isosceles triangles and rectangles.

(8) In anatomy, a small cap over a structure, shaped like a dome or inverted cup.

(9) In railway carriage design, a small viewing window in the top of the caboose (guard’s van) for looking over the train, or the part of the caboose where one looks through this window (obsolete).

1540–1550: From the Italian cupola, from the Late Latin cūpula (a small cask; a little tub), from the Classical Latin cuppella, from cuppa & cūpa (tub), from the Ancient Greek κύπελλον (kúpellon) (small cup), the construct being cūp(a) + -ula, from the primitive Indo-European -dlom (the instrumental suffix) and used as a noun suffix denoting an instrument.  The origin in Latin was based on the resemblance to an upturned cup, hence the use to describe the rounded top of just about any structure where no specific descriptor existed.  Cupola is a noun and cupolated & cupolar are adjectives; the noun plural is cupolas or cupolae.

Cupola on the dome of St Peter's Basilica, Vatican City, Rome.

In architectural history, the cupola is considered a descendent of the oculus, which may seem strange given the evidence suggests domes came first but a cupola is something which can be added to a dome and the earliest may have been “bolted on” when the open nature of an oculus proved troublesome.  Fitted with one or more windows, they would still permit the entry of light but keep out the wind and rain.  From this functional origin, they became popular as features to crown turrets, roofs, and larger dome.  Confusingly, architects at one point decided a cupola was also the inner vault of a dome so historic plans and descriptions need to be read with care.  Although classically dome-like in shape, most modern cupolas are more angular.

Onion domes on the Kremlin, Red Square, Moscow, Russia.

Cupolas were a favorite in early Islamic architecture and began their proliferation the mid-late eighth century, presumably because they were a perfect decorative addition to a mosque’s minarets but such was the appeal they would appear also in the core of the building or at its corners.  Before long, they were a regular part of commercial and residential buildings, valued not only as decoration but as a light source and for the ease with which they could sit atop vertical ducts used for ventilation.  It was the Islamic influence which was responsible for the best known motif of Russian architecture, the onion dome which was well suited to the northern climate because, constructed with severe lines, effortlessly they resisted the gathering of snow.  The Moors brought the design to Spain and whatever religious conflicts may for centuries have disfigured the Middle East & Europe, Architectural taste proved ecumenical and onion domes can still be seen atop Christian churches in Austria and southern Germany.

US Marine Corps M17 flame-thrower in use, the M1919A4 Browning .30 caliber medium machine gun to the right is hard-mounted in the tank commander's cupola, South Vietnam, 1968.

In military use, a cupola is basically a helmet fixed in place and that may be on a building, a ship or an armored vehicle, the function being to protect the head while offering a field of view.  Sometimes, especially in tanks or armored cars, guns or flame-throwers were integrated into cupolas and in naval gunnery, there was the special use to describe the dome-like structures protecting a (usually single) gun mounting, something which distinguished them from the larger, flatter constructions which fulfilled the same purpose for multi-gun batteries.

Cupola on the International Space Station (ISS), outside & in.  Cupolas are used on space craft because they are a way of maximizing the window space for a certain amount of the hull’s surface area.

McMansion with turrets and cupola.

Although the moment seems to have passed, one recent trend in domestic architecture which really disturbed the arbiters of style was the proliferation in parts of the US of McMansions, huge houses of sometimes dubious build quality often in a confusion of architectural styles and adorned with balconies, turrets, columns and cupolas, the more the better.

Phlebotomy

Phlebotomy (pronounced fluh-bot-uh-mee)

(1) The act or practice of opening a vein for letting or drawing blood as a therapeutic or diagnostic measure; the letting of blood and known in historic medicine as "a bleeding".

(2) Any surgical incision into a vein (also known as venipuncture & (less commonly) venesection).  It shouldn’t be confused with a phlebectomy (the surgical removal of a vein).

1350–1400: From the earlier flebotomye & phlebothomy, from the Middle French flebotomie, from the thirteenth century Old French flebothomie, (phlébotomie the Modern French) from the Late & Medieval Latin phlebotomia, from the Ancient Greek φλεβοτόμος (phlebotómos) (a lancet used to open a vein), the construct being φλέψ (phléps) (genitive phlebos) (vein), of uncertain origin + tomē (a cutting), from the primitive Indo-European root tem- (to cut).  The form replaced the Middle English fleobotomie.  The noun phlebotomist (one who practices phlebotomy, a blood-letter) is documented only as late as the 1650s but may have been in use earlier and operated in conjunction with the verb phlebotomize.  The earlier noun and verb in English (in use by the early fifteenth century) were fleobotomier & fleobotomien.  The Latin noun phlebotomus (genitive phlebotomī) (a lancet or fleam (the instruments used for blood-letting)) was from the Ancient Greek φλεβότομος (phlebótomos) (opening veins), the construct being φλέψ (phléps) (blood vessel) +‎ τέμνω (témnō) (to cut) +‎ -ος (-os) (the adjectival suffix).  The alternative spelling was flebotomus.  The noun fleam (sharp instrument for opening veins in bloodletting (and this in the pre-anesthetic age)) was from the late Old English, from Old French flieme (flamme in Modern French), from the Medieval Latin fletoma, from the Late Latin flebotomus, from Greek φλεβοτόμος (phlebotómos) (a lancet used to open a vein).  The doublet was phlebotome and in barracks slang, a fleam was a sword or dagger.  Phlebotomy & Phlebotomist are nouns, phlebotomize is a verb and phlebotomic & phlebotomical are adjectives; the noun plural is phlebotomies.

Phlebotomy describes the process of making a puncture in a vein cannula for the purpose of drawing blood.  In modern medicine the preferred term is venipuncture (used also for therapy) although the title phlebotomist continues to be used for those who specialize in the task.  One of the most frequently performed procedures in clinical practice, it’s commonly undertaken also by doctors, nurses and other medical staff.  Although the origins of phlebotomy lie in the ancient tradition of blood letting, it’s now most associated with (1) the taking of blood samples for testing by pathologists and (2) those carried out as “therapeutic phlebotomies” as part of the treatment regimen for certain disorders of the blood.  The inner elbow is the most often used site but in therapeutic medicine or in cases where the veins in the arms are not suitable, other locations can be used.

Bleeding the foot (circa 1840), oil on canvas following Honoré Daumier (1808-1879).

It’s an urban myth the Hippocratic Oath includes the clause: “First, do no harm” but by any reading that is a theme of the document and while the Greek physician Hippocrates of Kos (circa 460-circa 375 BC) wouldn’t have been the first in his field to regard illness as something to be treated as a natural phenomenon rather than something supernatural, he’s remembered because of his document.  His doctrine was one which took a long time to prevail (indeed there are pockets where still it does not), holding that treatment of ailments needed to be based on science (“evidence-based” the current phrase) rather than devotion or appeals to the gods.  His influence thus endures but one of his most famous theories which persisted for decades resulted in much lost blood for no known benefit and an unknown number of deaths.  Drawing from the notion of earlier philosophers that the basis of the universe was air, earth, water & fire, the theory was that there were four “humors” which had to be maintained in perfect balance to ensure health in body & mind, the four being flegmat (phlegm), sanguin (blood), coleric (yellow bile) & melanc (black bile) which were the source of the four personality types, the phlegmatic, the sanguine, the choleric & the melancholic.  Had Hippocrates and his successors left the humors in the realm of the speculative, it would now be thought some amusing fragment from Antiquity but unfortunately surgical intervention was designed to ensure balance was maintained and the mechanism of choice was bloodletting to “remove excess liquids”.

George Washington in his last illness, attended by Doctors Craik and Brown (circa 1800) engraving by unknown artist, Collection of The New-York Historical Society.

Apparently, bloodletting was practiced by the ancient Egyptians some 3000 years ago and it’s not impossible it was among the medical (or even religious) practices of older cultures and From there it’s known to have spread to the Middle East, Rome, Greece and West & South Asia, physicians and others spilling blood in the quest to heal and the evidence suggests it was advocated for just about any symptom.  The very idea probably sounds medieval but in the West that really was the nature of so much medicine until the nineteenth century and even well into the twentieth, there were still some reasonably orthodox physicians advocating its efficacy.  Still, in fairness to Hippocrates, he was a pioneer in what would now be called “holistic health management” which involved taking exercise, eating a balanced diet and involving the mind in art & literature.  He was an influencer in his time.  All the humors were of course good but only in balance so there could be too much of a good thing.  When there was too much, what was in excess had to go and apart from bloodletting, there was purging, catharsis & diuresis, none of which sound like fun.  Bloodletting however was the one which really caught on and was for centuries a fixture in the surgeon’s bag.

Blood self-letting: Lindsay Lohan as Carrie from the eponymous film, Halloween party, Foxwoods Resort & Casino, Connecticut, October 2013.

Actually, as the profession evolved, the surgeons emerged from the barber shops where they would pull teeth too.  The formal discipline of the physician did evolve but they restricted themselves to providing the diagnosis and writing scripts from which the apothecary would mix his potions and pills, some of which proved more lethal than bloodletting.  The bloodletting technique involved draining blood from a large vein or artery (the most productive soon found to be the median cubital at the elbow) but if a certain part of the body was identified as being out-of-balance, there would be the cut.  The mechanisms to induce blood loss included cupping, leeching & scarification and with the leeches, they were actually onto something, the thirsty creatures still used today in aspects of wound repair and infection control, able often to achieve better results more quickly than any other method.  Leeches have demonstrated extraordinary success in handing the restoration of blood flow after microsurgery and reimplantation and works because the little parasites generate substances like fibrinase, vasodilators, anticoagulants & hyaluronidase, releasing them into the would area where they assist the healing process by providing an unrestricted blood flow.  Of course the leeches don't always effect a cure.   When in 1953 doctors were summoned to examine a barely conscious comrade Stalin (1878-1953; Soviet leader 1924-1953), after their tests they diagnosed a haemorrhagic stroke involving the left middle cerebral artery.  In an attempt to lower his blood pressure, two separate applications of eight leeches each were applied over 48 hours but it was to no avail.  Had he lived he might have had the leeches shot but they probably lived to be of further service.

A Surgeon Letting Blood from a Woman's Arm, and a Physician Examining a Urine-flask (in some descriptions named Barber-Surgeon Bleeding a Patient), eighteenth century oil on canvas, attributed to school of Jan Josef Horemans (Flemish; 1682-1752); Previously attributed to Richard Brakenburg (Dutch; 1650-1702); Previously attributed to the Flemish School,

Scarification was a scraping of the skin and if the circumstances demanded more, leeches could be added.  Cupping used dome-shaped cups placed on the skin to create blisters through suction and once in place, suction was achieved through the application of heat.  However it was done it could be a messy, bloody business and in the twelfth century the Church banned the practice, calling it “abhorrent” and that had the effect of depriving priests and monks of a nice, regular source of income which wasn’t popular.  However, especially in remote villages far from the bishop’s gaze, the friars continued to wield their blades and harvest their leeches, the business of bloodletting now underground.  In the big towns and cities though the barbers added bloodletting to their business model and it’s tempting to wonder whether package deals were offered, bundling a blooding with a tooth pulling or a haircut & shave.  From here it was a short step to getting into the amputations, a not uncommon feature of life before there were antibiotics and to advertise their services, the barber-surgeons would hang out white rags smeared in places with blood, the origin of the red and white striped poles some barbers still display.  To this day the distinctions between surgeons and physicians remains and in England the Royal College of Physicians (the RCP, a kind of trade union) was founded by royal charter in 1518.  By the fourteenth century there were already demarcation disputes between the barber surgeons and the increasingly gentrified surgeons and a number of competing guilds and colleges were created, sometimes merging, sometimes breaking into factions until 1800 when the Royal College of Surgeons (RCS) was brought into existence.  It's said there was a time when fellows of the RCP & RCS, when speaking of each-other, would only ever make reference to "the other college", the name of the institution never passing their lips. 

Bloodletting tools: Late eighteenth century brass and iron “5-fingered” fleam.

Unfortunately, while doubtlessly lobbying to ensure the fees of their members remained high, the colleges did little to advance science and the byword among the population remained: “One thing's for sure: if illness didn't kill you, doctors would”.  It was the researchers of the nineteenth century, who first suggested and then proved germ theory, who sounded the death knell for most bloodletting, what was visible through their microscopes rendering the paradigm of the four humors obsolete.  By the twentieth century it was but a superstition.

Superleggera

Superleggera (pronounced soo-per-lee-ghera)

(1) In automotive coach-building, a method of construction which combined a framework of thin steel tubes with aluminum outer panels, producing a lightweight structure.

(2) In recent years, a designation used as a model name to refer to a “lightweight” vehicle even if not a classic superleggera structure.

1935 (a patent for the technique issued in 1936):  From the Italian superleggera (super light) (feminine singular of superleggero), the construct being super- +‎ leggero.  Super was from the Latin super-, from the Proto-Italic super, from the primitive Indo-European upér (over, above) which was cognate with the Ancient Greek ὑπέρ (hupér) (above) and the Proto-Germanic uber (now familiar in English and translated as “over” although this doesn’t wholly convey the sense in Modern German).  Leggero (light in weight, slight, thin) was from the Old French legier, from the Vulgar Latin leviārius, from the Latin levis, from the Proto-Italic leɣis, from the primitive Indo-European hlengwih-, from hléngus, from hleng (lightweight). The cognates included the Sanskrit लघु (laghú), the Ancient Greek ἐλᾰφρός & ἐλᾰχῠ́ς (elaphrós & elakhús) and the Old English lēoht (the ultimate source of the English light).  Superleggera is a noun & adjective; the noun plural is superleggeras (or in the Italian the masculine plural is superleggeri, the feminine plural superleggere).

Carrozzeria Touring and superleggera

It was in 1926 that two Milanese lawyers discussed how bored they were with mundane, if lucrative, legal work and much preferred the exciting world of the automobile, the industry then something like that of IT in the early twenty-first century in that a critical mass of users had been established, growth was consistent and new ventures were coming and going amid a milieu of M&A (mergers & acquisitions).  The lawyers negotiated a controlling interest in Milan-based coachbuilder Carrozzeria Falco, changing the company’s name to Carrozzeria Touring.  Contracts to provide bodywork soon followed including from some of the industry’s major manufacturers including Citroën, Isotta Fraschini & Alfa Romeo and for some time they continued to adopt Falco’s methods which was an adaptation of the “Weymann” system which involved laying fabric over lightweight frames supported by a traditional separate chassis.  Touring produced elegant coachwork of a high quality and attracted the patronage of both Benito Mussolini (1883-1945; Duce (leader) & prime-minister of Italy 1922-1943) and Victor Emmanuel III (1869–1947; King of Italy 1900-1946) although perhaps more influential was the Queen who was often photographed alighting from one of Touring’s large cars, a more imposing sight than the exit of her diminutive husband.

1938 Alfa Romeo 8C-2900B LeMans with Touring Superleggera (left), a wrought-iron artwork installation based on the idea using the Volkswagen Beetle as a model (centre) and Lindsay Lohan with conventional (body-on-chassis) Beetle (Herbie: Fully Loaded (2005)).

Touring proved innovative in its use of strong, lightweight alloys to support the fabric skins and they enjoyed much success also in applying the technique to aircraft components such as wings and fuselages but during the 1930s with both the military and civilian airlines wanting to fly higher, faster, for longer and in all weather, the shift was beginning towards all-metal construction.  This was an organic evolution of the Weymann technique but the weight and other characteristics of sheet aluminum differed greatly from stretched-fabric and the system needed substantially to be re-engineered and it was the lessons learned from fabricating fuselages which led to Touring developing superleggera, the design patented in 1936.  The essence of superleggera was a skeleton of small diameter tubes which formed a body’s core shape, to which were attached thin aluminum-alloy panels which provided both aerodynamic form and strength.  Compared with earlier methods, as well as being inherently light, the method afforded great flexibility in fashioning shape and Touring took advantage of the properties of the metal to create both complex and flowing curves.  Some of their cars of the era did have lovely lines and in addition to the collaboration with Alfa Romeo which yielded sports cars, gran turismo machines and racing cars, the house attracted business from Lancia, Bianchi and others.

1938 Lancia Astura IV series coupé by Touring (left), 1949 Ferrari 166mm barchetta by Touring (centre), and 2014 Ducati 1199 Superleggera (right).

In the post war years, an era in which demand was high and regulations rare, the number of cars built according to the superleggera system increased as Touring licensed the use of its patent to others including Hundon in the US, Pegaso in Spain and Bristol, Aston Martin & Lagonda in England.  Bristol particularly took to the idea because of their long experience with airframes but perhaps the most influential stylistically was the 1948 Ferrari 166 MM Touring barchetta, a charismatic shape which provided a template which would remain recognizable in Ferraris for a quarter-century, the motif of the egg-crate grill still in use today.  While superleggera was unsuited to volume production, for the exclusive ranges at the upper end of the market it was ideal and both Lamborghini and Maseratis emerged built with the technique.  Although the two are sometimes confused because there are visual similarities under the skin, the space-frame method differs in that it can support the whole structural load whereas a superleggera is attached to an existing chassis.

1960 Aston Martin DB4 GT Zagato (left), 1961 Aston Martin DB4 Convertible (centre; the Volante designation wasn't then in use) and 1965 Aston Martin DB5 Saloon.

In the public mind, the most enduring connection was with Aston Martin which was granted a license to use the design and the Superleggera construction method at its Newport Pagnell plant for a fee of £9 for each of the first 500 bodies and £5 for each subsequent unit and the DB4 & DB5 (the latter made famous in the early James Bond films) were both built thus.  However, they represented something of the end of the era because governments were starting to pass laws which demanded road cars attain a certain degree of crash-worthiness, something the superleggera technique couldn’t be adapted conform to without sacrificing the very lightness which was its raison d'etre.  Additionally, the manufacturers were moving swiftly to replace body-on-frame with unit-construction.  Touring attempted to adapt to the changing environment by offering its services as a coach-builder for small, exclusive production runs and made the necessary capital investment but it had become crowded field, the supply of coach-builders exceeding the demand for their skills.  Touring ceased operations in 1966 but four decades on, there was an unexpected revival of the name, the company re-established as Carrozzeria Touring Superleggera, offering automotive design, engineering, coach-building, homologation services, non-automotive industrial design, and the restoration of historic vehicles.  A number of very expensive one-off and limited-production ventures for Maserati, Alfa Romeo and Bentley followed but what attracted most comment was the Sciàdipersia, shown in coupé form at the Geneva Motor Show in 2018, the cabriolet introduced the flowing year.  Based on the underpinnings of the Maserati Grantourismo, although owing no visual debt, it was very much in the tradition of the three Maserati 5000 GTs Touring built in 1959-1960, the first of which had been ordered by the Shah of Iran.  Superleggera however is now just a name with an illustrious history, the method of construction no longer in use and when used as a model designation, it now simply denotes what a literal translation of the Italian suggests: lightweight.

The original Maserati 5000 GT "Shah of Iran" by Touring (left; chassis #103-002) and Touring's Maserati Sciàdipersia in coupé form (centre; 2018) and roadster (right; 2019).

Vickers Wellingtons (B-series, Mark 1) during production, the geodesic structure visible, Brooklands, England, 1939.

There are obvious visual similarities between the classic superleggera method and the geodesic structure used in airframes and some buildings, most famously the “geodesic dome”.  The imperatives of both were strength both aim to create strong and lightweight structures, but they differ in their specific design and application.  As used in airframes, the geodesic structure consisted of a network of intersecting diagonal braces, creating a lattice framework which distributed loads as evenly as possible while providing a high strength-to-weight ratio.  This was of great significance in military airplanes used in combat because it enhanced their ability better to withstand damage better, the stresses distributed across the structure rather than being restricted to a limited area which could create a point-of-failure.  The geodesic framework was based on geometric principles which had been developed over centuries and typically employed hexagons & triangles to render a structure which was both rigid & light.  Superleggera construction differed in that it involves the creation of a lightweight tubular frame, covered with aluminum body panels of a thinness which wouldn’t have been possible with conventional engineering.  The attraction of the superleggera technique was the (relatively) minimalistic framework supported the skin, optimizing weight reduction without compromising strength.  So, structurally, the difference was the geodesic design used a network of intersecting braces to form a lattice, while the superleggera construction used a tubular frame covered with panels.

Geodesic

Geodesic (pronounced jee-uh-des-ik or jee-uh-dee-sik)

(1) In spherical geometry, a segment of a great circle.

(2) In mathematics, a course allowing the parallel-transport of vectors along a course that causes tangent vectors to remain tangent vectors throughout that course (a straight curve, a line that is straight; the shortest line between two points on a specific surface).

1821: A back-formation from geodesy (a branch of science dealing with the measurement and representation of Earth, its gravitational field and geodynamic phenomena (polar motion, Earth tides, and crustal motion) in three-dimensional, time-varying space and with great (and "down-to-earth" as it were) practical application in surveying.  The adjectives geodesical & geodetic had first appeared in 1818 & 1819 respectively, both from geodetical which had been in use since the early seventeenth century.  All the forms are derive ultimately from the Ancient Greek γεωδαισία (geodaisía) from γῆ (geo) (earth) + δαιεῖν (daiesthai) ("to divide" or "to apportion") and the use in English was most influenced by the French géodésique, dating from 1815.  In general use, the word entered general use after 1953 when it was used of the "geodesic dome" (a structure built according to geodesic principles); despite the earlier use in wartime aircraft construction, the use there was only ever "engineer's slang".    Geodesic is a noun & adjective, geodesicity is a noun, geodesical is an adjective and geodesically is an adverb; the noun plural is geodesics.    The alternative adjectival form geodetic appeared in 1834 but fell from use by mid-century.  

Four-dimensional space-time.

Geodesic describes the curve that locally minimizes the distance between two points on any mathematically defined space, such as a curved manifold; essentially the path is the one of the most minimal curvature so, in non-curved three-dimensional space, the geodesic is a straight line.  Under Albert Einstein's (1879-1955) theory of general relativity (1915), the trajectory of a body with negligible mass on which only gravitational forces are acting (ie a free falling body), defines the geodesic in curved, four-dimensional spacetime.  Dictionaries and style guides seem to prefer “space-time” but scientists (and space nerds) like “spacetime” and because it was one of them who “invented it”, it seems polite to ignore the hyphen.  The term, a calque of the German Raumzeit (the construct in English being (obviously) space + time) first appeared in a paper by German mathematician Hermann Minkowski (1864–1909), published in the Philosophical Review.  The existence of the noun plural "spacetimes" does not imply something to do with the so-called multiverse (in cosmology, a hypothetical model in which simultaneously more than one universe exists) but rather that there are different space-times created in different places at different times.

General relativity fan girl Lindsay Lohan in optical illusion dress from the Autumn-Winter collection of interior designer Matthew Williamson (b 1971), illustrating an object causing the curvature of spacetime, Gift Global Gala, Four Seasons hotel, London, November 2014.  An “optical illusion dress” is one which uses a fabric print or other device to create the effect and differs from an “illusion dress” which is made with skin-tone fabrics placed to emulate the wearer’s own flesh.

In Einstein's theory of general relativity, gravity is treated not as a force as had been the historic understanding explained in the writings of Sir Isaac Newton (1642–1727) but rather as a curvature of spacetime caused by the presence of mass and (thus) energy.  The Sun, being a massive object, causes a (relatively) significant curvature in the surrounding spacetime and the Earth, as it moves through this curved spacetime, follows a path (a geodesic) which manifests as what appears to be an “orbit” around the Sun.  It is this curvature of spacetime that is perceived as the “gravitational pull” of the Sun on the Earth, keeping it in a (relatively) stable and predictable orbit.  Einsteinian physics supplanted Newtonian physics as the structural model of the universe and nothing has since been the same. 

Hull of Vickers R.100 Airship.

Sir Barnes Wallis (1887-1979) was an English engineer, best remembered as the inventor of the bouncing bomb used by the Royal Air Force in Operation Chastise (dubbed the "Dambusters" raid) to attack the Ruhr Valley dams during World War II and the big Tallboy (6 tonnes) and Grand Slam (10 tonnes) deep-penetration "earthquake" bombs.  Wallis had been working on the Admiralty’s R.100 airship when he visited the Blackburn aircraft factory and was surprised to find the primitive wood-and-canvas methods of the Great War era still in use, a notable contrast to the elegant and lightweight aluminum structure of airships.  He was soon recruited by Vickers to apply his knowledge to the new generation of fixed-wing aircraft which would use light alloy construction for the internal structure.  His early experience wasn’t encouraging, the first prototype torpedo bomber, which used light alloy wing spars inspired by the girder structure of R.100, breaking up mid-air during a test-flight.  Returning to the drawing board, Wallis designed a revolutionary structural system; instead of using beams supporting an external aerodynamic skin, he made the structural members form the aerodynamic shape itself.

The geodesic structure in an airframe.

The principle was that the members followed geodesic curves in the surface, the shortest distance between two points in the curved surface although he only ever referred to it in passing as geodetic; it wouldn’t be until later the label came generally to be applied to the concept.  As a piece of engineering, it worked superbly well, having the curves form two helices at right angles to one another, the geodetic members became mutually supporting, rendering the overall framework immensely strong as well as comparatively light.  Revolutionary too was the space efficiency; because the geodetic structure was all in the outer part of the airframe meant that the centre was a large empty space, ready to take payload or fuel and the inherent strength was soon proven.  While conducting the usual wing-loading stress tests to determine the breakage point, the test routine was abandoned because the wings couldn’t be broken by the test rig.

Vickers Wellseley.

The benefits inherent in the concept were soon demonstrated.  Vickers’ first geodesic aircraft, the Wellesley, entered service in 1937 and in 1938, three of them, making use of the massive fuel capacity the structure made possible, flew non-stop from Ismailia in Egypt to Darwin in Australia, setting a new world record distance of 7,158 miles (11,265 km), an absolute record which stood until broken in 1946 by a Boeing B-29 Superfortress; it remains to this day the record for a single-engined aircraft with a piston engine, and also for aircraft flying in formation.  While the Wellesleys were under construction, Wallis designed a larger twin-engined geodetic bomber which became the Vickers Wellington, the mainstay of the RAF’s Bomber Command until 1943 when the new generation of four-engined heavy bombers began to be supplied in in the volume needed to form a strategic force.  Despite that, the Wellington was still used in many roles and remained in production until after the end of hostilities.  Over eleven-thousand were built and it was the only British bomber to be in continuous production throughout the war.

Vickers Wellington fuselage internal detail.

The final aircraft of the type, with a more complex geodetic structure was a four-engined heavy bomber called the Windsor but testing established it didn’t offer significantly better performance than the heavies already in service, and the difficulties which would be caused by trying to replicate the servicing and repair infrastructure was thought too onerous so it never entered production.  Post-war, higher speeds and operating altitudes with the consequent need for pressurised cabins rendered the fabric-covered geodetics obsolete.

Aston Martin DB4 GT Zagato (one of 19 in the "Continuation Series", production of which began in 2019) during construction, an aluminium panel being attached to the superleggera frame, Aston Martin Works, Newport Pagnell, Buckinghamshire, England.

There are obvious visual similarities between the classic superleggera method and the geodesic structure used in airframes and some buildings, most famously the “geodesic dome”.  The imperatives of both were strength both aim to create strong and lightweight structures, but they differ in their specific design and application.  As used in airframes, the geodesic structure consisted of a network of intersecting diagonal braces, creating a lattice framework which distributed loads as evenly as possible while providing a high strength-to-weight ratio.  This was of great significance in military airplanes used in combat because it enhanced their ability better to withstand damage better, the stresses distributed across the structure rather than being restricted to a limited area which could create a point-of-failure.  The geodesic framework was based on geometric principles which had been developed over centuries and typically employed hexagons & triangles to render a structure which was both rigid & light.  Superleggera construction differed in that it involves the creation of a lightweight tubular frame, covered with aluminum body panels of a thinness which wouldn’t have been possible with conventional engineering.  The attraction of the superleggera technique was the (relatively) minimalistic framework supported the skin, optimizing weight reduction without compromising strength.  So, structurally, the difference was the geodesic design used a network of intersecting braces to form a lattice, while the superleggera construction used a tubular frame covered with panels.