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Sigsbee Sounding Machine - invented by Charles D. Sigsbee and modified fromThomson Sounding Machine. Basic design of ocean sounding instruments stayed the same for the next 50 years. Here the sounding machine is used to set a Pillsbury current meter at a known depth. In: The Gulf Stream, by JohnElliott Pillsbury, 1891. Call Number GC296.G9 P54 1891. (Image credit: NOAA Central Library)