Image: Borda and Cassini pendulum experiment
Description: Drawing of pendulum experiment to determine the length of the seconds pendulum at Paris, conducted in 1792 by Jean-Charles de Borda and Jean-Dominique Cassini. From their original paper. They used a pendulum that consisted of a 1 1/2 inch (3.8 cm) platinum ball suspended by a 12 foot (3.97 m) iron wire (F,Q). It was suspended in front of the pendulum (B) of a precision clock (A). Alterations to image: moved observer (O) closer to wall to reduce unwieldy size of image, converted to PNG. Image shows aliasing artifacts (crosshatching) from scanning of original halftone image.
Title: Borda and Cassini pendulum experiment
Credit: Downloaded 2009-01-27 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. Image credited in text to J. C. Borda and J. D. Cassini de Thury, 'Experiénces pour connaitre la longuer de pendule qui bat les secondes à Paris', in 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 2.
Author: Jean-Charles de Borda and Jean-Dominique Cassini
Permission: Public domain - Borda died in 1799, Cassini in 1845
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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