Digital Library Search
Image
Download ( 1.03 MB )Permalink
https://www.noaa.gov/media/digital-library-photo/pl23ship3238jpgDescription
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