pl23_theb1330.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1330jpg-0Description
Mendenhall half-second pendulums.Figure 2 of William Bowie's Investigations of Gravity and Isostasy
Credit
NOAA Central Library
Display Date
Ca. 1895
Collection
Historic Coast & Geodetic Survey
Keywords
Geophysics
Gravity