Siren

Siren (pronounced sahy-ruhn)

(1) In classical mythology, one of several sea nymphs, sometimes depicted as part-woman, part-bird and sometimes as as sisters, who lured mariners to destruction by seductive singing.

(2) A woman who sings sweetly and charms.

(3) In slang, a seductively beautiful or charming woman, especially one who beguiles men; a seductress, temptress or vamp; a dangerous women who preys on the weaknesses of men.

(4) An acoustical instrument for producing musical tones, consisting essentially of a disk pierced with holes arranged equidistantly in a circle, rotated over a jet or stream of compressed air, steam, or the like, so that the stream is alternately interrupted and allowed to pass.

(5) An variation of this implement which makes a piercingly loud sound and used as a whistle, fog signal, or warning device; the sound made by such a device.

(6) In zoology, (1) any of several aquatic, eel-like salamanders of the family Sirenidae, having permanent external gills, small forelimbs, and no posterior limbs, (2) a member of Sirenia, an order of mammals or (3) any of various nymphalid butterflies of the genus Hestina.

(7) Anything seductive or tempting, especially dangerously or harmfully.

(8) In music, a musical instrument (one of the few aerophones in the percussion section of the symphony orchestra).

(9) An instrument for demonstrating the laws of beats and combination tones.

(10) In astronomy & astrophysics, an astrophysical event which can be used for calculating cosmic distances. 

1300-1350: From the Middle English siren & sereyn from the Old French sereine, (the Modern French sereine dating from the twelfth century), from the Late Latin sīrēna and the Classical, Latin Sīrēn & Sīrēna, from the Ancient Greek Σειρήν (Seirḗn).  The Seirēnes were the alluring sea nymphs of classical mythology and the figurative sense of "one who sings sweetly and charms" was first noted in the 1580s although the classical descriptions of them were mangled in medieval translations, resulting in some odd and fantastical notions of their appearance and they were often conflated with mermaids.  The Vulgate (the Biblia Vulgata, the fourth century translation of the Bible which, through the choices of words and senses made by the translator had a profound effect on Christianity and Christendom) also gifted to Middle English the use of the word to describe an imaginary species of flying serpents, based on glossary explanations of the Latin sirenes in Isaiah 13:22.    In the Greek the word was used also to mean "a deceitful woman" although etymologists note that may have been literally "binder, entangler", from seira (cord, rope).  In zoology, the mammalian sense appeared first in was first attested in French in Les entretiens d'Ariste et d'Eugène (Conversations between Ariste & Eugène) by the French Jesuit priest Dominique Bouhours (1628–1702) while the use to describe the aquatic salamander was introduced in 1766 by Swedish zoologist & physician Carl Linnaeus (1707–1778 and styled as Carl von Linné after 1761) for a genus of reptiles.

The use to describe the mechanical device which "makes a warning sound" was first recorded in 1879 when they were installed on steamboats and this may have been imitative of the similar French word.  In the course of the twentieth century, the things were adapted as audible warning devices for many purposes including air raids, emergency service vehicles and fire alarms.  In schools, workplaces and other geographically large sites, they were used to mark the start and finish of shifts, meal breaks etc.  As late as the 1940s, the spelling variation sireen also existed but it (like the Elizabethan adjectives sirenean, sirenian, sirenic, sirenical & sireny) is extinct although the writer & critic John Ruskin (1819–1900 and known for his fondness for nymphs), used sirenic so with that imprimatur, some modern aesthete might be tempted to revive the form. 

Odysseus and the Sirens

In Greek mythology, the Sirens were deadly creatures who used their lyrical and earthly charms to lure sailors to their death.  Attracted by their enchanting music and voices, the seduced seafarers would sail their ships too close to the rocky coast of the nymph's island and there be shipwrecked.  Not untypically for the myths of antiquity, the sirens are said to have had many homes.  The Romans said they lived on some small islands called Sirenum scopuli while later authors place them variously on the islands of Anthemoessa, on Cape Pelorum, on the islands of the Sirenuse, near Paestum, or in Capreae.  All were places with rocky coasts and tall cliffs.

Sirens and the Night (1865), oil on canvas by William Edward Frost (1810-1877).

It was Odysseus who most famously escaped the sirens.  Longing to hear their songs but having no wish to be shipwrecked, he had his sailors fill their ears with beeswax, rendering them deaf.  Odysseus then ordered them to tie him to the mast.  Sailing past, when he heard their lovely voices, he ordered his men to release him but they tightened the knots, not releasing him till the danger had passed.  Some writers claimed the Sirens were fated to die if a man heard their singing and escaped them and that as Odysseus sailed away they flung themselves into the water and drowned.  The idea of the sirens persists in idiomatic use:  The "siren sound" is used to refers to words or something which exerts a particular compelling attraction but a "siren call" can be used of something not directly audible such as the thoughts evoked by a painting or even a concept, populism, fascism & communism all described thus at times.

The Chrysler Air Raid Siren and the Firepower V8  

According to Guinness World Records, the loudest sirens ever were the 350-odd built by Chrysler for the US government in the early 1950s and installed around the country to warn of an impending nuclear attack by the Soviet Union.  The maximum volume the devices generated was recorded (at a distance of 100 feet (30.5 m)) as 138 decibels (dB), a level which meant a human would be deafened if within 200 feet (61 m) during their operation.  Guinness noted the compressor discharge throughput at peak volume was 74 m³ (2,610 cubic feet at 7 lb per square inch) of air per second and the physics of fluid dynamics (air a fluid in this context) was such that this would have caused a sheet of paper in the path spontaneously to ignite.  By comparison the now retired supersonic airline Concorde at take-off produced noise levels between 112-114 dB at a distance of 100 feet and even the after-burner equipped military jets (F-16, F-35 et al) haven’t been recorded as generating levels as high as 138 dB.

Although there were ebbs in the tensions, the “High Cold War” is regarded as the time between the early 1950s and mid 1960s, the public perception of which was dominated by the fear of nuclear war. The US government made many preparations for such an event, notably building vast underground facilities where essential personnel (members of the administration, the Congress and their families and servants) could live until it was safe to emerge into the post- apocalypse world).  The tax-payers who paid for these facilities were of course rather less protected but the government in 1952 did install warning sirens in cities; people might still be vaporized by comrade Stalin's (1878-1953; Soviet leader 1924-1953) H-Bombs but they would know it was coming so there was that.

The early version was co-developed by Chrysler and Bell Labs and named the Chrysler Bell Victory Siren which sounded optimistic but although the acoustic properties met the specification, the drawback was the devices were manually controlled and required someone physically to be there to start the thing and, being directional, rotate it so the sound would be broadcast 360^o.  The obvious flaw was that were there to be a nuclear attack in the area, the job-description was self-sacrificial, something comrade Stalin would doubtless have thought just the part of the cost of war with the unfortunate soul posthumously to be awarded the coveted Герой Советского Союза (Hero of the Soviet Union) decoration.  However, neither the White House or the Pentagon like the optics of that and revised specifications were issued.

Photograph by Rob Storms of Chrysler Air Raid Siren atop Rochester Fire Department Maintenance Building, Rochester, Monroe County, New York.

Chrysler responded with a more elaborate device which was automated and remotely administrated, the Chrysler Air Raid Siren introduced in 1952.  It was powered by the corporation’s new 331 cubic inch (5.4 litre) Hemi-head V8, rated at what was then a stellar 180 HP (134 kW), a three-stage compressor added to increase output.  Instead of demanding a potentially doomed operator, there was a control panel connected (with nothing more than the two-pair copper cables which became familiar as Cat3) to dedicated phone lines so it could be activated either by local civil defense authorities or the military.  The big V8 provided sufficient power to both increase the dB and the geographical coverage, the siren able to be heard over an area of some 15.8 square miles (41 km³), an impressive number given the electric sirens used today for tornado and tsunami warnings have an effective footprint of only some 3.9 square miles (10 km³).

Chrysler Air Raid Siren being delivered, 1953.

In 1952, there was no engine better suited to the task than Chrysler’s new “FirePower” V8.  Applying their wartime experience building a number of high-output, multi-cylinder engines (the most remarkable a V16 aero-engine rendered obsolete by jet technology before it could be used), the FirePower featured hemispherical combustion chambers and was the corporation’s first use of overhead-valves.  Both designs had been around for decades but in time, Chrysler would make a (trade-marked) fetish of “Hemi”, continuing cheerfully to use the name for a range of V8s introduced in 2003 even though they were no longer a true hemi-head, the design unable to be adapted to meet modern exhaust emission laws.  The so-called “third generation” Hemi remains available still although how long it will last will be a matter of the interplay of politics and demand.  Doubtless, it’s on Greta Thunberg’s (b 2003) hit-list and that she and the engine debuted in the same year will impress her not at all.

Chrysler FirePower 392 cubic inch V8 in 1957 Chrysler 300C Convertible.

The FirePower was first sold in 1950 in 331 cubic inch (5.4 litre) form, growing over the decade first to 354 (5.8) and then 392 (6.4) before being retired in 1959, the wedge-headed alternative with increased displacement a cheaper path to power.  Chrysler and Imperial shared the engines but remarkably, in an approach which today must shock accountants and efficiency experts, the companion divisions (De Soto & Dodge) produced nine different hemi-head V8s with capacities between 241 (4.0) and 345 (5.6) with relatively little commonality of components between them all.  The last of the FirePowers were noted also for being one of the first offered with electronic fuel injection which offered real advantages over the mechanical systems then available in a handful of models in Europe and the US but the technology was then too fragile to be reliable and most of the 16 sold (reputedly all but one) were recalled and retro-fitted with a pair of faithful four barrel carburettors.  In 1964, the hemi-head was revived for a racing engine and, to satisfy the regulatory body which had been unimpressed with the use of such a thing in a series for “stock” cars, it was made available to the public between 1966-1971, this time actually called “Hemi”.  In 426 cubic inch (7.0 litre) form, it was this iteration which built the reputation which Chrysler still exploits.

Some 350 Chrysler Air Raid Sirens were built, all by the Marine & Industrial Engine division based in Trenton, Michigan, some still in service as late as the 1970s.  During the era of détente, the last were retired, some sold to museums or collectors while some were just abandoned because, mounted atop tall buildings to maximize their acoustic coverage, the cost of removal far exceed their value as units or scrap.  Three fully functioning Chrysler Air Raid Sirens still exist, one in a remote part of Texas where it’s safe to stage the occasional demonstration of the sound.  During these displays, the clear zone (minimum safe distance) extends 320 feet (97.5 m) but even at this range, anyone standing directly in front of the projection horns would find the experience uncomfortable, prolonged exposure likely to damage one’s hearing.  Although directional, there’s much “sound soak” otherwise in the proximity in the device just operating the siren from the side control panel requires a minimum hearing protection of 30 dB.

Lindsay Lohan as a siren; it would seem almost a calling.

One collector attracted to them was Don Garlits (b 1932) who in the post-war years was among the most innovative and successful drivers and builders in the sport of drag-racing which became wildly popular and it was with Chrysler Hemis he build his reputation.  In 1997, a documentary crew from the UK visited Garlits and saw one of the old sirens sitting neglected in the storeroom where it’d sat for decades after having spent some twenty years in the salt-laden air atop a Florida high-rise.  Remarkably, after doing little more than connecting a battery and checking the oil and coolant, once a carburetor had been bolted on with a can of gasoline (petrol) rigged up, it started almost immediately.  What was most surprising was that it had never before run on gasoline because the sirens had always used propane.  As Garlits over the decades discovered a ¼ mile at a time, the FirePower was a tough old thing.

Chrysler Air Raid Siren at the Don Garlits Museum of Drag Racing, re-awakened after decades, 1997.