Portable underwater signalling transducer

Details Portable underwater signalling transducer Portable underwater signalling transducer

1977-01-19

1978-06-20

Yasich, Daniel M.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

116137A, 181113, 340 14, B63B 4508, G01L 1912

Patent

active

040956679

ABSTRACT:
A portable underwater signalling apparatus for use by divers having self-contained underwater breathing apparatus (scuba) to signal to other divers as well as surface and underwater vessels. The apparatus utilizes compressed air from the diver's tanks to drive a hammer against a diaphragm to cause sound waves to be transmitted through the water.

REFERENCES:
patent: 2961639 (1960-11-01), Atanasoff
patent: 3053220 (1962-09-01), Sawyer
patent: 3056378 (1962-10-01), Simmonds
patent: 3224409 (1965-12-01), Fenger et al.
patent: 3277437 (1966-10-01), Bouyoucos
patent: 3433202 (1969-03-01), Sharp et al.
patent: 3719160 (1973-03-01), Christianson
patent: 4010708 (1977-03-01), Keledy et al.

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