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Development of Gravity Pendulums in the 19th Century
Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966

written by "Multhauf, Robert P., 1919-2004"
...ended so that the distance between the knife edges could be measured by a comparator. Plantamour found it impracticable to adjust a disk until the times of swing about each knife edge were equal. ... read more