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NOAA Photo Library Image - ship3427

Submarine sound signaling apparatus in Knight's Modern Seamanship (Seventh Edition 1917). This system was first invented in the early 1900's. Long distance sound transmission in the ocean for navigational purposes preceded the use of acoustics for depth measurement.

Image ID: ship3427, Voyage To Inner Space - Exploring the Seas With NOAA Collect


High Resolution Photo Available





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Last Updated:
May 12, 2014