File:Clock showin sidereal time.jpg
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| Description |
Deutsch: Pendeluhr für Sternzeit, erbaut 1909 (Teilansicht)
English: Face of a Riefler astronomical regulator clock, made by the Clemens Riefler Co. in Munich Anno 1909. One of the first clocks to have a low thermal expansion invar pendulum rod (not pictured), this was probably the most accurate clock in the world around the turn of the century. It was typically accurate to 15 ms per day, and was guaranteed to be within 20 ms. Like many precision regulators, the gear train was made with as few gears as possible to reduce friction-induced error. As a consequence the minute and hour hands are not mounted at the center of the dial but offset on the ends of their driving gears. The small moon-shaped hole in the face allowed the action of the electric remontoir which drove the clock to be viewed. |
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| Date | Taken on 30 August 2010 | ||||||||||||||||||||||||||
| Source | Self-photographed | ||||||||||||||||||||||||||
| Author | User:Mattes | ||||||||||||||||||||||||||
 | A geocoded location could be added to this image. Visit Commons:Geocoding for information on how to add coordinates. Beta-test: Add coordinates helps to determine coordinates. |
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:14, 16 October 2010 | | 1,552 × 1,683 (1.67 MB) | Mattes (talk | contribs) | ==Summary== {{Information |Description={{de|München - Deutsches Museum, Uhr für Sternzeit}} |Source={{own}} |Date=2010-08-30 |Author=User:Mattes |Permission= |other_versions= }} =={{int:license}}== {{PD-self}} [[Category:Deutsches Museum|Sidereal |
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