File:Giovanni Di Dondi clock.jpg

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Giovanni_Di_Dondi_clock.jpg (400 × 507 pixels, file size: 47 KB, MIME type: image/jpeg)

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Description
English: Drawing of Giovanni De Dondi's astronomical clock, built 1379, Padua, Italy. It was weight driven This may be the earliest known drawing of a balance wheel (crown shaped, at top) and a verge escapement (wheel under it). The balance wheel had a beat of 2 seconds. Originally from Giovanni de Dondi, 'Il Tractatus Astarii', 1379.
This is a modern tracing of an illustration in a 1461 manuscript at Oxford (MS Laud. Misc. 620 Folio 10). The original illustration can be seen here: Whitrow, Gerald (1989) Time in History, p.106. I copied it from the website, Engines of our Ingenuity, part 1535, Inventing the Clock.
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Source http://www.uh.edu/engines/epi1535.htm
Author Giovanni de Dondi

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current04:49, 10 June 2007Thumbnail for version as of 04:49, 10 June 2007400 × 507 (47 KB)Chetvorno (talk | contribs){{Information |Description=Drawing of Di Dondi clock, built 1379, Padua, Italy. From Giovanni di Dondi, 'Il Tractatus Astarii', 1379 |Source=http://www.uh.edu/engines/epi1535.htm |Date=1379 |Author=Giovanni di Dondi |Permission= |other_versions= }}

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