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pl23_ship3237.jpg

Demonstrating listening device, very similar to a telephone, used on board ships with submarine signaling apparatus

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https://www.noaa.gov/media/digital-library-photo/pl23ship3237jpg

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