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![Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus ship3237.jpg Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship3237.jpg?itok=BrVg5Ikz)
Description
Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus. In: Submarine Signaling, ScientificAmerican Supplement, No. 2071, pp. 168-170, Sept. 11, 1915.
Collection
Voyage to Inner Space