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Figure 48 Picture

Figure 48

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.”

Photo Category: Oceanography

Author: Y. Berard/Oceanographic Museum of Monaco/ NOAA

License: Public Domain Mark 1.0 (Public domain)
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Added On
18th October 2015
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