Comparative Tests of QC, JK, and JL Listening Gear on U.S.S. SEALION

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Apr 19, 1940
Accession Number
AD1161925

Entities

People

  • E. B. Stephenson

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Amplifiers
  • Audio Frequency
  • Background Noise
  • Coefficients
  • Deep Water
  • Directional
  • Errors
  • Frequency
  • Intensity
  • Mean
  • Measurement
  • Noise
  • Periscopes
  • Propeller Noise
  • Propellers
  • Shallow Water
  • Water

Readers

  • Materials Science
  • Naval Architecture and Marine Engineering.