semaphore arm मीनिंग इन हिंदी

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The second semaphore arm on twin-armed semaphore signals had a slightly different shape.
The traffic lights paired Stop and Go semaphore arms with small red and green lights.
Red was quickly chosen as the best colour for semaphore arms as it was clearly visible against most backgrounds.
In original form, the turn signals were not blinking lamps, but lighted semaphore arms that flipped out from the side pillars.
These early signals, manufactured by the Acme Traffic Signal Co ., paired Stop and Go semaphore arms with small red and green lights.
An open door was first indicated by a semaphore arm, but these were easily damaged, and by 1923 interlock switches proving the doors were closed were introduced.
The watchman hoisted up the telegraph mast, one semaphore arm for a schooner, two for a brig, three for a ship and two raised about 45 degrees for a paddle steamer.
The fogsignalman's duty was to repeat the indication of the signal using his lantern; the semaphore arm was usually obscured by fog and hence invisible to the driver of a moving train.
On 9 December 1868, the first, non-electric, gas-lit traffic lights were installed outside the semaphore arms with red and green gas lamps for night-time use, on a pillar, operated by a police constable.
The semaphore arm consists of two parts : An "'arm "'or "'blade "'which pivots at different angles, and a "'spectacle "'holding coloured lenses which move in front of a lamp in order to provide indications at night.