Original form of Mendenhall half-second pendulum gravity measuring apparatus.
Figure 3 of William Bowie's "Investigations of Gravity and Isostasy"
Image ID: theb1332, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: Ca. 1895
Credit: NOAA Central Library
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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April 30, 2013