The submarine in war and peace; its developments and its possibilities (1918)
Lake, Simon, 1866-1945 · Philadelphia London : J.B. Lippincott Co. · leaf 312
his oscillator andimproved sound detector, with which it is possible for sub-marines to carry on wireless conversations under water whenat a distance of several hundred feet apart, and to pick upthe characteristic sounds of different types of surface shipsat considerable distances. Sound detectors… … ifPfiJi
Submarines (Ships)
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