File:Grandfather clock pendulum.png
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Summary
| Description |
English: Drawing of a typical grandfather clock pendulum, from a 1901 physics book. It is a seconds pendulum, with each swing of the pendulum taking one second. Slightly less than 1 meter (39 in.) long. It consists of a metal weight suspended on a wooden rod, since wood expands and contracts with temperature less than metal, keeping the period of the pendulum more constant. Under the weight is a knurled rate adjustment nut, which adjusted the rate of the clock by moving the weight up and down on the pendulum rod. The weight has a streamlined disc shape to minimize air resistance. Alterations to image: removed caption. |
| Date | |
| Source | Downloaded 2009-01-16 from Charles H. Henderson & John F. Woodhull (1901) The Elements of Physics, D. Appleton & Co., New York, p.59, fig.21 on Google Books. |
| Author | Charles H. Henderson and John F. Woodhull |
| Permission (Reusing this file) |
Public domain in US - published in US prior to 1923 |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:31, 28 February 2009 | | 188 × 628 (7 KB) | Chetvorno | {{Information |Description= {{en|Drawing of a grandfather clock pendulum, from a 1901 physics book. }} |Source=Downloaded 2009-01-16 from [http://www.google.com/books?id=PTgAAAAAYAAJ&pg=PA59 Charles H. Henderson & John F. Woodhull (1901) ''The Elemen |
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