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pl23_ship3238.jpg

Submarine signal apparatus installed on a lightship and ready to be lowered to25 feet below the surface

Image

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https://www.noaa.gov/media/digital-library-photo/pl23ship3238jpg

Description

Submarine signal apparatus installed on a lightship and ready to be lowered to25 feet below the surface. In Submarine Signaling, Scientific AmericanSupplement, No. 2071, pp. 168-170, Sept. 11, 1915.

Collection

Voyage to Inner Space