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| Keywords: Kater pendulum use.png Drawing of the use of a Kater's pendulum a reversible freeswinging pendulum invented in 1817 by British captain Henry Kater as a gravimeter instrument to measure the local acceleration of gravity The image shows Kater's original pendulum and is probably from Kater's original 1818 paper The pendulum had two opposing pivots near either end of the rod consisting of short knife blades so it could be hung from either end with the knife blades resting on agate plates As shown the pendulum was swung in front of a precision pendulum clock that had been adjusted to keep correct time by the passage of stars overhead The precise times when the two pendulums swung in synchronism were determined by looking through the sight on the left to eliminate parallax error The adjustment weight on the rod was adjusted until the pendulum had the same period of swing when hung from either pivot From this period and the distance between the pivots the strength of gravity could be calculated precisely Alterations to image removed frame converted to 32 greyscale PNG Downloaded 2009-01-30 from http //books google com/books id EXQLAAAAMAAJ pg PA308 John Cox 1904 Mechanics Cambridge Univ Press London p 308 fig 147 on Google Books The same picture in http //books google com/books id A1IqAAAAMAAJ pg PA316 Victor F Lenzen Robert P Multauf 1964 'Paper 44 Development of gravity pendulums in the 19th century' Smithsonian Institution Bulletin 1964 Smithsonian Institution press Washington p 316 fig 12 credited in text to Collection de Mémoires Relatifs a la Physique publiés par la Société Française de Physique Vol 4 Mémoires sur le pedule précédés d'une bibliographie Gauthier-Villars Paris 1889 Plate 5 Almost certainly from Kater's original paper Henry Kater 1818 'An account of experiments determining the length of the pendulum vibrating seconds in the latitude of London' Philos Trans Royal Society Vol 108 p 33 1818 Henry Kater Public domain - Kater died in 1835 PD-old Pendulums Precision pendulum clocks Gravimetry Parallax 19th-century longcase clocks | ||||
