Comparative Tests of QC, JK, and JL Listening Gear on U.S.S. SEALION
[Technical Report, Formal Report]
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
On 15 and 24 January 1940 comprehensive comparative tests were made of the sound gear on the U.S.S. SEALION while listening to the propeller noise from the U.S.S. SEMMES as target. The equipment consisted of a keel mounted, rochell salt JK projector, a keel mounted combination JK and magnetostriction QC projector, number of QC units all-directional mounted around the conning tower, all operated at a frequency of 24 kilocycles, and a JL equipment consisting of a series of hull mounted magnetophones on lines each side of the bow operating at audio frequencies through an electrical compensator and amplifiers.
- Marine Engineering