File:Borda and Cassini pendulum experiment.png
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Summary
DescriptionBorda and Cassini pendulum experiment.png |
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
Public domainPublic domainfalsefalse |
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. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information). | |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Items portrayed in this file
depicts
1889
image/png
e12e0098bb02bdaf40987974b8f2d477ea5f5aee
305,097 byte
861 pixel
585 pixel
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Date/Time | Dimensions | User | Comment | |
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current | 09:39, 2 May 2021 | 585 × 861 (298 KB) | Materialscientist | background |
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Horizontal resolution | 28.35 dpc |
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Vertical resolution | 28.35 dpc |
File change date and time | 16:38, 2 May 2021 |