2013.049.430
Blueprint
Sounding Machine
One blueprint drawing of a "Sounding Machine." The drawing (sheet 1 of 1) shows plan, profile, end views, and details of a deck-mounted sounding machine that was used to measure lake water depths. The various views and details are shown at scales of 0.5 inches = 1 foot or 1.5 inches = 1 foot. A title block in the lower right corner of the sheet shows that the drawing was prepared by the "U. S. Lake Survey, Detroit, Mich.," and is dated September 29, 1939.
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