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![Thomson piano wire sounding machine as mounted on USS TUSCARORA theb3775.jpg Thomson piano wire sounding machine as mounted on USS TUSCARORA](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb3775.jpg?itok=7YOFhR0a)
Description
Thomson piano wire sounding machine as mounted on USS TUSCARORA.This machine was invented by Sir William Thomson, a.k.a. Lord Kelvin.Made use of heavy weight and piano wire - line paid out until weight hit bottom. This machine revolutionized deepsea sounding.Variations would be used for over 50 years (Image credit: NOAA Central Library )