File:Using Kater pendulum in India.png

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DescriptionUsing Kater pendulum in India.png	English: Drawing of the measurement of the acceleration of gravity with an invariable pendulum at Madras, India by British astronomer John Goldingham in 1821. From his 1822 paper to the Royal Society. The pendulum swings on two knife edge pivots suspended from a bracket on the wall, in front of a precision pendulum clock set to correct time by the stars. The periods of the two pendulums are compared, using a sight to eliminate parallax error. The strength of gravity is calculated from the period of the pendulum. Alterations to image: Removed caption and frame. Image contains aliasing artifacts from scanning of original halftone image, partially removed with Gimp Fourier transform tool. Converted to 64 greyscale PNG.
Date	1822
Source	Downloaded 2009-01-20 from Victor F. Lenzen, Robert P. Multauf (1964) 'Paper 44: Development of gravity pendulums in the 19th century' in United States National Museum Bulletin 240: Contributions from the Museum of History and Technology, reprinted in Bulletin of the Smithsonian Institution, 1964, Smithsonian Institution Press, USA, p.317, fig.13 on Google Books. Text credited drawing to John Goldingham (1822) 'Observations for Ascertaining the Length of the Pendulum at Madras in the East Indies', Philosophical Transactions of the Royal Society, Vol. 112, p.127
Author	John Goldingham
Permission (Reusing this file)	Public domain - Goldingham died in 1849

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:47, 21 January 2009		770 × 543 (200 KB)	Chetvorno (talk \| contribs)	== Summary == {{Information \|Description= {{en\|Drawing of the measurement of the acceleration of gravity with a Kater's pendulum at Madras, India by British astronomer John Goldingham in 1821. Alterations to image: Removed
	13:39, 21 January 2009		768 × 540 (201 KB)	Chetvorno (talk \| contribs)	{{Information \|Description= {{en\|Drawing of the measurement of the acceleration of gravity with a Wikipedia:Kater's pendulum at Madras, India by British astronomer John Goldingham in 1821. Alterations to image: Removed caption and frame. Downloaded

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