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Mechanical Depth Sounder
Document Type: Artifact
Geographic Location:
ID Number: 1972_3
Keywords: Navigation, 1972.3
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Description:
Mechanical depth sounder, which works like a log, with a spinning impeller measuring depth as it drops through the water column. A release keeps the impeller from turning as the sounder is pulled back up. One gauge measures from 2 to 30 fathoms and the other from 30 to 150 fathoms. Like the patent log, this was also invented by Walker, with a Patent number 8486 G engraved on sounder.
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