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Summary
| Description |
English: Drawing of Riefler escapement, invented by Sigmund Riefler in 1889, from the catalog of the Columbian Exposition, Chicago, 1893. It was used in the precision astronomical regulator clocks produced by the German firm Clemens Riefler from 1890 to 1965. The escapement's advantage was that it applied impulses to keep the pendulum swinging by flexing the suspension spring (i) that supported the pendulum, rather than applying force directly to the pendulum. The spring is attached to a metal support (A) that rocks back and forth on knife edges (c) resting on agate plates (P). Riefler clocks achieved an accuracy of 10 milliseconds per day, possibly the most accurate all-mechanical clocks ever made. Alterations to image: rotated image 90° CW, rotated R drawing a few degrees to justify, moved R drawing closer to L and aligned drawings vertically, converted to 32 color PNG. |
| Date | |
| Source | Downloaded from German Exhibition, Group 21, Special Catalog of the Exhibition of Scientific Instruments, Columbian Exposition, Chicago, 1893, p.63 on Google Books. The drawing came originally from the firm that manufactured it, Clemens Riefler |
| Author | Clemens Riefler |
| Permission (Reusing this file) |
Public domain in USA - published in USA 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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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:33, 29 May 2008 | | 1,303 × 784 (220 KB) | Chetvorno | {{Information |Description={{en|1=Drawing of Riefler escapement, invented by Sigmund Riefler in 1889 and used in the precision astronomical regulator clocks produced by the German firm Clemens Riefler from 1890 to 1965.}} |Source=Downloaded from [http://b |
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