File:Borda and Cassini pendulum experiment.png
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Size of this preview: 407 × 599 pixels. Other resolutions: 163 × 240 pixels | 585 × 861 pixels.
Original file (585 × 861 pixels, file size: 298 KB, MIME type: image/png)
Summary
| Description |
English: 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. |
| Date | |
| Source | 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 (Reusing this file) |
Public domain - Borda died in 1799, Cassini in 1845 |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:39, 2 May 2021 | | 585 × 861 (298 KB) | wikimediacommons>Materialscientist | background |
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