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Add automatic river gauge. After dialing the Potomac River Gauge, A.L. King, U.S. Weather Bureau observer, waits for the first buzz, then sets his stop watch which continues until the buzz signal is again heard then he stops the watch. The time interval between the two signals is converted into the
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Credit lineAdd automatic river gauge. After dialing the Potomac River Gauge, A.L. King, U.S. Weather Bureau observer, waits for the first buzz, then sets his stop watch which continues until the buzz signal is a. 1938-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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