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| Keywords: Giovanni Di Dondi clock.png 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 http //www almagest co uk/middle/astrar htm Giovanni De Dondi's Astrarium Alterations to image converted to 8 color PNG 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 https //www flickr com/photos/quadralectics/8260966962/in/set-72157632209741685 here It is almost certainly originally from Giovanni de Dondi's 1364 treatise on his clock Tractatus Astrarii Downloaded from http //books google com/books id xYhlNoUu-toC pg PA50 sig k48xMb-kxFGrrYA8_FMzMEfFxCY hl en 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 Original illustration 1461 Giovanni de Dondi Public domain - author died in 1389 PD-old Astrarium Medieval manuscripts Old horology prints Giovanni Dondi | ||||
