An Ultra-sensitive Microphone

Radio Record, Volume IV, Issue 47, 5 June 1931, Page 7

An Ultra-sensitive Microphone

For Detecting Icebergs HH liner Leviathan is shortly to be equipped with an ultra-sensitive microphone capable of detecting the presence of icebergs within a distance of five to six miles from the steamer. The instrument is constructed on the lines of a medical stethoscope, which, by means of a rubber tube, is zonnected to a diaphragm mounted on the side of the ship below sea level. It:is claimed that the microphone will pick up the sounds made by the melting of the ice and the consequent disintegration of the bergs as they drift in the viciuity of the regular trade routes.