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NOAA Photo Library Image - ship4505

Figure 48. Walker log, used to measure the speed of a ship under way. This instrument was towed behind a vessel and the number of turns of the rotor during a given interval was directly proportional to the speed of the vessel through the water. This instrument was apparently invented prior to 1882 and sold under the name "T. Walker's patent harpoon ship log."

Image ID: ship4505, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

Category: Oceanography/

High Resolution Photo Available

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Last Updated:
November 10, 2017