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![In: The United States Fish Commission by Richard Rathbun expl3056.jpg In: The United States Fish Commission by Richard Rathbun](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl3056.jpg?itok=PMd932w6)
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In: The United States Fish Commission by Richard Rathbun. Century Magazine,Vol. 43, Issue 5. 1892. Sounding the abyss with piano-wire. This image is among the most realistic representations of sounding with the Sigsbee SoundingMachine. Most of the deep-sea soundings made prior to the advent of acousticsystems were made with piano-wire sounding machines. (Image credit: NOAA Central Library Historical Collections)