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 Sounding
Machine. Most of the deep-sea soundings made prior to the advent of acoustic
systems were made with piano-wire sounding machines.
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