Fail:Giovanni_Di_Dondi_clock_.png
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![Fail:Giovanni Di Dondi clock.png](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Giovanni_Di_Dondi_clock.png/497px-Giovanni_Di_Dondi_clock.png)
Originaline fail (964 × 1162 piksel'ad, failan suruz': 72 kb, MIME-tip: image/png)
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Lühüd kirjutuz
KirjutuzGiovanni 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. |
Päiv | Original illustration: 1461. |
Augotižtekst | 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. |
Tegii | Giovanni de Dondi |
Laskend (Failan toine kävutamine) |
Public domain - author died in 1389. |
Licenzii
Public domainPublic domainfalsefalse |
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https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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Päiv/Aig | Kuvaine | Suruded | Kävutai | Kirjutez | |
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nügüdläine | 21. kezaku 2008, kell 20:03 | ![]() | 964 × 1162 (72 kb) | 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 |
1. heinku 2007, kell 19:57 | ![]() | 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 |
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