Image:Giovanni Di Dondi clock .png
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[edit] Summary
| Description |
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 4 color PNG.
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| 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: Whitrow, Gerald (1989) Time in History, p.106. It is almost certainly originally from Giovanni de Dondi's 1364 treatise on his clock, Tractatus Astrarii. Downloaded July 1, 2007 from the website, Engines of our Ingenuity, part 1535, Inventing the Clock. A copy appears in 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. |
| Date |
Original illustration: 1461. |
| Author |
Giovanni de Dondi |
| Permission (Reusing this image) |
Public domain - author died in 1389. |
[edit] Licensing
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This image (or other media file) is in the public domain because its copyright has expired. This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years.
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| current | 16:57, 1 July 2007 | 400×507 (23 KB) | Chetvorno | (== Summary == {{Information |Description=Drawing of Giovanni De Dondi's astronomical clock, built 1379, Padua, Italy. This may be the earliest known drawing of a balance wheel (crown shaped, at top) and a verge escapement (wheel under it). The balance w) |
