Devices for continuously indicating the depth of water under a ship

Abstract

Abstract 236,601. Drysdale, C. V., Smith, B. S., and Mackintosh, E. V. Jan. 29, 1924. Determining distances acoustically.-Heavily damped sounds are emitted at regular intervals of not less than one-tenth of a second by a subaqueous sound-emitter on one side of a ship's hull, and the echoes are detected by a microphone located on the other side of the hull, the telephone receivers being short-circuited except for a brief period which coincides with the arrival of the echo. Thus the current through a sound emitter 6 is suddenly interrupted once per revolution of the shaft 1, the diaphragm of the transmitter being thereupon released to give a damped note. This is effected by means of an insulating segment 4 on the metal disc 9. The telephones 11 are short-circuited by brushes 3 engaging conducting rings 3<a>, 12, except at the instant when the insulating segment 5 is passing under a brush, and this instant can be made to coincide with the arrival of the echo at the microphone 10 by rotating the ring 12. Hence in operating the apparatus the ring 12 is turned until the echoes can be heard in the telephones 11, whereupon the dapth can be read from the uniform scale 23 against the pointer 15. To allow for the inclination of the sound ray, the zero position of the pointer may be varied by a cam. Specifications 22940/14 and 237,933 are referred to.

Inventors

No inventors recorded.

Bibliographic Details