Semaphore

Semaphore (pronounced sem-uh-fawr or sem-uh-fohr)

(1) A “line-of-sight” apparatus (mechanical, hand-held or activated and now even electronic) for conveying information by means of visual signals (typically flags or lights, the positions of which are changed as required).

(2) Any of various devices for signaling by changing the position of a light, flag or other identifiable indicator.  Historically, a common use of “semaphore” was as a noun adjunct (also called a noun modifier or attributive noun) including “semaphore flag”, “semaphore chart”, “semaphore operator et al.

(3) A codified system of signaling, especially a system by which a special flag is held in each hand and various positions of the arms denoting specific letters, numbers etc.  It remains part of Admiralty signals training.

(4) In biochemistry (as semaphoring), any of a class of proteins that assist growing axons to find an appropriate target and to form synapses.

(5) In biology (as semaphoront), an organism as seen in a specific time during its ontogeny or life cycle, as the object of identification or basis for systematics.

(6) In botany (as semaphore plant), a synonym for the telegraph plant (Codariocalyx motorius), a tropical Asian shrub, one of the few plants capable of rapid movement and so named because the jerking motions of the leaves recalled in observers the actions of the arms of Admiralty signallers and the name dates from the Raj.

(7) In programming, a bit, token, fragment of code, or some other mechanism which is used to restrict access to a shared function or device to a single process at a time, or to synchronize and coordinate events in different processes, the thread increments the semaphore to prevent other threads from entering the critical section at the same time.

(8) In figurative use (in human and animal behavior), certain non-verbal communications, used consciously and unconsciously, the concept often explored as a literary device.

(9) To signal (information) by means of semaphore

1814: From the French sémaphore, the construct being the Ancient Greek, σῆμα (sêma) (mark, sign, token) + the French -phore (from the Ancient Greek -φόρος (-phóros), the suffix indicating a bearer or carrier) and thus understood as “a bearer of signals”.  The Greek –phóros was from pherein (to carry), from the primitive Indo-European root bher- (to carry).  The verb was derived from the noun.  Semaphore is a noun & verb, semaphorist, semaphoront & semaphorin are nouns, semaphored is a verb, semaphoring is a verb & adjective, semaphoric & semaphorical are adjectives and semaphorically is an adverb; the noun plural is semaphores.  The noun semaphorism is non-standard but is used in behavioral linguistics to describe patterns of language used to convey meaning in a “coded” form which can be deconstructed for meaning only by sender and receiver.  The form semaphoreology seems not to exist but if anyone ever makes a discipline of the study semaphore (academic careers have been built from some improbable origins), presumably there will be semaphoreologists.

Chart of the standard semaphore alphabet (top left), a pair of semaphore flags (bottom left) and Lindsay Lohan practicing her semaphore signaling (just in case the need arises and this is the letter “U”), 32^nd birthday party, Mykonos, Greece, July, 2018 (right).

Semaphore flags are not always red and yellow, but the colors are close to a universal standard, especially in naval and international signalling.  There was no intrinsic meaning denoted by the use of red & yellow, the hues chosen for their contrast and visual clarity, something important in maritime environments or other outdoor locations when light could often be less than ideal although importantly, the contrast was sustained even in bright sunshine.  Because semaphore often was used for ship-to-to ship signalling, the colors had to be not only easily distinguishable at a distance but not be subject to “melting” or “blending”, a critical factor when used on moving vessels in often pitching conditions, the operator’s moving arms adding to the difficulties.  In naval and maritime semaphore systems, the ICS (International Code of Signals) standardized full-solid red and yellow for the flags but variants do exist (red, white, blue & black seem popular) and these can be created for specific conditions, for a particular cultural context or even as promotional items.

L-I-N-D-S-A-Y-space-L-O-H-A-N spelled-out in ICS (International Code of Signals) semaphore.  One can never tell when this knowledge will come in handy.

Early automobiles were sometimes fitted with mechanical semaphore signals to indicate a driver’s intention to change direction; these the British called “trafficators” (“flippers” in casual use) and they were still being fitted in the late 1950s, by which time they’d long been illuminated to glow a solid amber.  What the mechanical semaphores did was use the model of the extended human arm, used by riders or drivers in the horse-drawn age to signal their intentions to others and although obviously vulnerable to damage, the devices were at the time a good solution although the plastics used from the 1930s were prone to fading, diminishing the brightness.  When electronics advanced to the point where sequentially flashing turn indicators (“flashers”) cheaply could be mass-produced the age of the semaphore signal ended although they did for a while persist on trucks where they were attached to the exterior of the driver’s door and hand activated.

Hand-operated semaphore signal on driver's door of RHD (right-hand-drive) truck (left), an Austin A30 with electrically-activated semaphore indicating impending leftward change of direction (centre) and electrically-activated right-side semaphore on 1937 Rolls-Royce Phantom III Gurney Nutting Touring Limousine (right).

The A30 (1952-1956) was powered by an 803 cm³ (49 cubic inch) four cylinder engine while the Phantom III (1936-1939) was fitted with a 7338 cm³ (447 cubic inches) V12 (noted diarist Sir Henry “Chips” Channon (1897–1958) owned one) so the driving experience was very different but both used the same Lucas semaphore assembly.  Note the "BEWARE, TRAFFICATORS IN USE" notice in A30's rear window.  Because drivers are no longer attuned to look for the now archaic semaphores, some jurisdictions (while still allowing their operation), will permit road registration only if supplementary flashing indicators (now usually amber) are fitted.  In the 1960s many trafficator-equipped cars were modernized with flashers and it's now only collectors or restorers who prize the originality of the obsolete.

Left & right semaphore signals (trafficators): Lucas part number SF80 for one’s Austin A30, Morris Minor or Rolls-Royce Silver Wraith.  In the 1950s, the price may have varied between resellers.

Although the grim realities of post-war economics meant standardization began to intrude, even in the 1950s Rolls-Royce made much of things being “bespoke” and while that was still true of some of the coach-work, what lay beneath the finely finished surface was often from the industry parts-bin and the semaphore turn signals the company fitted to the Silver Wraith (1946-1958) and Silver Dawn (1949-1955) was Lucas part number SF80 and exactly the same component used by the humble Austin A30 and Morris Minor (1948-1971) where the functionality was identical.  Presumably were one to buy the part from Rolls-Royce one would have been charged more (perhaps they wrapped in more elaborate packaging) and that’s a well-understood industry phenomenon.  The internet has made it easier to trace such commonalities but in the 1980s there was a most useful publication which listed shared part-numbers which differed only in the prices charged, a switch for a Lamborghini which might retail for hundreds available from the Fiat parts counter (a busy place) for $12 while those aghast at the price quoted for a small linkage in a Triumph’s Stag’s induction system were pleased the same thing could be bought from a Ford dealer for a fraction of the cost.  Rolls-Royce fitted their last trafficator in 1958 and when Austin updated the A30 as the A35 (1956-1968) flashers were standard equipment, metal covering the apertures where once the semaphores had protruded while internally there was a panel concealing what had once been an access point for servicing.  The Morris Minor, the last of which wasn’t (in CKD (completely knocked down) form) assembled in New Zealand until 1974(!) switched from trafficators to flashers in 1961, the exterior and interior gaps concealed al la the A35.

Left-side semaphore on 1951 Volkswagen Type 1 (Beetle).

The Latin sēmaphorum (the alternative form was sēmaphoru) is thought to be a calque of the Italian semaforo (traffic light), again borrowed from the French sémaphore in the literal sense of “signaling system”.  The modern Italian for “traffic light” is semaforo although (usually for humorous effect) sēmaphorum is sometimes used as Contemporary Latin.  Traffic lights have for over a century regulated the flow of vehicles in urban areas but the first semaphore signal predated motorized transport, installed in London in 1868.  It was introduced not because it would perform the task better than the policemen then allocated but because it was cheaper and was an example of the by then common phenomenon of machines displacing human labor.  The early mechanical devices were pre-programmed and thus didn’t respond to the dynamics of the environment being controlled and that applied also to the early versions of the now familiar red-amber-green “traffic lights” which began to proliferate in the 1920s but by the 1950s there were sometime sensors (weight-sensitive points in the road) which could “trigger” a green light if the pre-set timing was creating a needless delay.  Even before the emergence of AI (artificial intelligence) in the modern sense of the term, implementations of AI had been refining the way traffic light systems regulated vehicular flow and in major cities (China apparently the most advanced), cameras, sensors, face and number plate recognition all interact to make traffic lights control the flow with an efficiency no human(s) could match.

ASMR semaphore porn: 1955 Austin A30.  ASMR (Autonomous Sensory Meridian Response) describes the physical & psychological pleasure derived from specific stimuli (usually a sound).  For some this can be the sound of South Korean girls on TikTok eating noodles while for others it can come from hearing semaphore turn-signals being raised and lowered.

Whether it was the early semaphore signals or the soon to be ubiquitous illumined red-amber-green lights, what the system relied on was compliance; inherently, lacking physical agency, a piece of colored glass can’t stop a car but that almost always is the effect of a “red light”.  In behaviorism, this was described as discriminative stimulus (SD) in that the red light culturally is understood as a universal cue signalling a punishment might follow any transgression (ie “running the red light”), thus the incentive to obey the signal and avoid negative consequences (crashing or being fined).  What SD does is control behavior through learned association.  The use of red comes from semiotics and the color is culturally assigned to “stop” (as green is to “go”, these allocated by virtue of historical associations which long pre-date the technology in the same way semiotics are used (and red & blue) to denote “hot” & “cold” water when taps are labelled, meaning for travellers no knowledge of a local language is needed to work out which is which.  In the jargon, the red light is a “signifier” and the “signified” is stop.

Modern Mechanix magazine, January 1933.

Sir William Morris (1877-1963; later Lord Nuffield) held a number of troubling and even at the time unfashionable views and he’d been sceptical about producing the Morris Minor, describing the prototype as looking “like a poached egg”; in that he was right but the Minor proved a highly profitable success.  In the 1930s however, he did have the imaginative idea of adapting the by then familiar traffic light (in miniature form) to the automobile itself.  The concept was sound, Sir William’s proposed placement even anticipating the “eye level brake lights” of the 1980s and the inclusion of green in the code was interesting but the “mini traffic light” wasn’t taken up and lesson which should have been learned is that in the absence of legislation compelling change, the industry always will be most reluctant to invest and not until the 1960s would such mandates (for better and worse) begin to be imposed.

1947 Volvo P444 (1947-1958, left) and 2022 Volvo XC 40 (introduced 2017, right).  Volvo abandoned the semaphores years before the British but the designers clearly haven’t forgotten, the rear reflectors on the XC 40 using the shape.  Volvo also adopted the conventional flasher but not before the modernist Swedes had tried the odd inventive solution.

In idiomatic use, semaphore’s deployment tends to be metaphorical or humorous, the former used as a literary device, borrowed from behavioral psychology.  “To semaphore” can mean “wildly or exaggeratedly gesture” but can also convey the idea of a communication effected without explicitly stating something and that can either be as a form of “unspoken code” understood only between the interlocutors or something unconscious (often called body-language).  “Semaphoring a message” can thus be either a form of secret communication or something inferred from non-verbal clues.  Authors and poets are sometimes tempted to use “semaphore” metaphorically to describe emotional cues, especially across physical or emotional distance and one can imagine the dubious attraction for some of having “her sensuous lips silently semaphoring desire” or “her hungry eyes semaphored the truth”.  Among critics, the notion of “semaphoring” as one of the motifs of modernist literature was identified and TS Eliot’s (1888–1965) style in The Waste Land (1922) included coded fragments, often as disconnected voices and symbols, called by some an “emotional semaphore”, and Samuel Beckett (1906-1989 and another Nobel laureate) was noted for having his characters exchange their feelings with repetitive gestures, signals and critically, silences, described variously as “gestural semaphore” or the “semaphoring of despair”.