File:Invariable pendulum00.jpg
Invariable_pendulum00.jpg (155 × 472 pixels, file size: 9 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionInvariable pendulum00.jpg |
English: Drawing of a gridiron pendulum, a temperature compensated pendulum for precision clocks invented by John Harrison in 1726. The parallel rods are made of two different metals, zinc and steel, with different rates of thermal expansion. If the temperature increases, the zinc rods expand more than the iron, compensating for the expansion of the iron rods, keeping the total length of the pendulum constant, so its period of swing doesn't change with temperature. |
Date |
circa 1725 date QS:P,+1725-00-00T00:00:00Z/9,P1480,Q5727902 |
Source | German Wikipedia |
Author | John Harrison (1693-1776) |
Permission (Reusing this file) |
Public Domain |
Other versions | Bild:Rostpendel2.png |
Licensing
[edit]Public domainPublic domainfalsefalse |
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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.
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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
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:24, 15 February 2008 | ![]() | 155 × 472 (9 KB) | Rotational~commonswiki (talk | contribs) | {{Information |Description=Invariable pendulum |Source=German Wikipedia |Date=ca. 1725 |Author=John Harrison |Permission=Public Domain |other_versions=Bild:Rostpendel2.png }} Category:Pendulum |
05:22, 15 February 2008 | ![]() | 155 × 472 (9 KB) | Rotational~commonswiki (talk | contribs) | {{Information |Description=Invariable pendulum |Source=Drawing by |Date=ca. 1725 |Author=John Harrison |Permission=Public Domain |other_versions=Bild:Rostpendel2.png }} Category:Pendulum |
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