Submarine Signaling

The Submarine Signal Company designed listening devices used in antisubmarine warfare in WWI. This booklet, published in 1920, describes development and testing of various signaling and listening devices.

(Second ten pages posted, 01-2014. More to come.)

Photo Set - click to view large versions: 
Submarine Signaling - cover
Submarine Signaling - message
Submarine Signaling - Pneumatic Bell
Submarine Signaling - Title Page
Submarine Signaling - Rodman Swift
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