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Summary
| Description |
English: Drawing of the verge escapement in Giovanni de Dondi's astronomical clock the 'Astrarium', built 1348-1364, Padua, Italy. From Tractatus Astrarii, a manuscript by Giovanni de Dondi around 1364. The caption claims this is the earliest existing drawing of a verge escapement. The crown shaped wheel at top is the clock's balance wheel, which had an oscillation period of 4 seconds. The escapement is just below it. The crown wheel is drawn with 24 teeth, which must have been an error, because verge escapements require an odd number of teeth to operate. Alterations to image: cropped out caption, converted to JPEG. |
| Date | circa 1364 |
| Source | Retrieved May 31, 2008 from John David North (2005) God's Clockmaker: Richard of Wallingford and the Invention of Time, Hambleton & London Co., London, UK, ISBN:1852854510, p.179, fig.33 on Google Books. Credited in the caption to Giovanni de Dondi's 1364 manuscript Tractatus Astrarii in MS 631, Biblioteca Civica, Padua, folio 13r. |
| Author | Giovanni de Dondi |
| Permission (Reusing this file) |
Public domain - author died in 1389 |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:00, 1 June 2008 | | 560 × 591 (91 KB) | Chetvorno | {{Information |Description={{en|1=The earliest known drawing of a verge escapement, from ''Tractatus Astarii'', a manuscript describing his astronomical clock, by Giovanni di Dondi around 1364}} |Source=Retrieved from [John David North (2005) ''God's Cloc |
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