Accession Number : ADD000045

Title :   Underwater Earphone.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Abbognaro,Louis A

Report Date : 09 Oct 1973

Pagination or Media Count : 4

Abstract : The patent describes an underwater earphone having a cylindrical casing sealed at one end by the vibratable diaphragm and at the other end by a flexible rubber diaphragm. The casing, including pole pieces and energizing coils is filled with silicone oil providing damping. This construction equalizes the pressure on either side of the vibratable diaphragm and prevents the ingress of water.

Descriptors :   *Earphones, *Patents, Underwater equipment, Underwater communications, Diver equipment, Communication equipment

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE