Receiver for Submarine Signalling.
Реферат: 2185. Signal Ges. Dec. 18, 1912, [Convention date]. Subaqueous sound signals.-The sound vibrations are received by a tuning-fork B which is mounted on the ship's side A and carries a microphone C between its prongs. There may be a spring coupling between the tuning-fork and the ship's side.
Submarine signalling apparatus
Номер патента: GB246431A. Автор: . Владелец: Submarine Signal Co. Дата публикации: 1926-08-24.