Naval History and Heritage Command

Naval History and Heritage Command

C-Tube Illustration #2

Sketch of the operation of a C-tube listening device.
Title: C-Tube Illustration #2
Caption: This diagram shows the inner workings of a C-tube listening device.
Original Location: Submarine Signal Company Descriptive Specifications of General Electric Company's "C" Tube Set, RG 45, Entry 520, Box 338, National Archives, Washington, DC
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