Image:Verge escapement Giovanni di Dondi.jpg

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[edit] 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. Alterations to image: cropped out caption, converted to JPEG.
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.
Date

around 1364
Author

Giovanni de Dondi
Permission
(Reusing this image)

Public domain - author died in 1389

[edit] Licensing:

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File history

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Date/TimeDimensionsUserComment
current06:00, 1 June 2008560×591 (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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