File:Giovanni Di Dondi clock.png

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Summary

DescriptionGiovanni Di Dondi clock.png	English: Drawing of the bottom section of Giovanni de Dondi's astronomical clock, the Astrarium, finished 1364, Padua, Italy. This early weight-driven clock kept time with a balance wheel (crown shape, at top) driven by a verge escapement (wheel under it). This is one of the earliest existing drawings of those mechanisms. The balance wheel had a beat of 2 seconds. The actual clock was a lot more complicated than this drawing, which only shows the lower section containing the weights, escapement and main gear train. The upper section, mounted on top of this, had 7 dials, displaying the astrological motions of the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn. See Giovanni De Dondi's Astrarium. Alterations to image: converted to 8 color PNG.
Date	Original illustration: 1461.
Source	This is a modern tracing of an illustration in a 1461 manuscript at Oxford University (MS Laud. Misc. 620 Folio 10). A photo of the illustration can be seen here. It is almost certainly originally from Giovanni de Dondi's 1364 treatise on his clock, Tractatus Astrarii. Downloaded from Dohrn-van Rossum, Gerhard (1996) History of the Hour: Clocks and Modern Temporal Orders, Univ. of Chicago Press, Chicago, USA, p.50, fig.8 caption credits it to Manuscript 172, Eton College, UK.
Author	Giovanni de Dondi
Permission (Reusing this file)	Public domain - author died in 1389.

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current	19:03, 21 June 2008		964 × 1,162 (72 KB)	wikimediacommons>Chetvorno	== Summary == {{Information \|Description={{en\|Drawing of the bottom section of Giovanni de Dondi's astronomical clock, the Astrarium, finished 1364, Padua, Italy. This early weight-driven clock kept time with a balance whe

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