File:Early Chronometer Balance Wheels.png
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Summary
| Description |
English: Drawings of temperature-compensated marine chronometer balance wheels. These were designed during the 1st half of the 19th century by British chronometer makers attempting to improve on the standard Earnshaw balance, and win prizes at the British Admiralty Chronometer Trials. These are all attempts at solving the 'middle temperature problem'. An Earnshaw balance, when adjusted to keep time at high and low temperatures, gains as much as 4 seconds/day at middle temperatures from nonlinearity. The one on the right actually uses a tube of mercury for compensation. From Glasgow, David (1885), Watch and Clock Making, Cassell Co., p.247-256
Alterations to image: Collected five separate drawings from the book into one image Français : Chronomètres de marine à température compensée. |
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| Source | Downloaded source images from David Glasgow (1885), Watch and Clock Making, Cassell & Co., New York, p.247-256 on Google Books. | ||||
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| Permission (Reusing this file) |
Public Domain - author died more than 70 years ago.
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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.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:21, 1 July 2007 | | 1,169 × 229 (25 KB) | Chetvorno | {{Information |Description=Experimental temperature-compensated marine chronometer balance wheels. These were designed during the 1st half of the 19th century by British chronometer makers attempting to improve on the standard Earnshaw balance, and win pr |
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