Voicepipe
Voicepipes were rigid or flexible speaking tubes running between stations on a ship between which reliable oral communication was helpful. They were a common tool in all navies, and popular for their relatively fail-safe nature in combat.
Calling Up
Some voicepipes had covers with whistles in them, and the means of calling up the remote station was to remove the cover on your end, place your mouth over a mouthpiece and blow vigourously into the tube to cause the whistle at the other end to sound.[Citation needed]
Others, particularly those placed in noisy places, had electrical call bells situated nearby.[1][2] As technology and resourced permitted, voicepipes in such places were often replaced by navyphones such as the Pattern 1856 Navyphone, which were more easily heard.
Loudness
Voicepipes were not always very useful in spaces where the sound of machinery or conversations of others could get in the way. It was common practice in such places for voicepipes and navyphones to be allotted an enclosed space called a "silent cabinet", which must have often been a relative term.
By the end of the war, at least, it was decided that some multiple outlet voicepipe networks would benefit from the installation of stop cocks to shunt off stations not essential to the current situation, such as alternate control stations.[3]
Blocking Poisonous Gas
Between 1916 and 1919, a study had been done to see whether diaphragms could be inserted in voicepipes to act as barriers against poison gasses that might travel along the pipes. "Ferrotype" was found to be a suitable material which did not reduce the acoustic efficiency of the tubes appreciably.[4]
See Also
Footnotes
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