Piotr Szokalewicz

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Piotr Szokalewicz
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Persian Astrolab by wybnormal, via Flickr - Rendez vos souvenirs durables avec www.remix-numerisation.fr

This early Persian astrolabe with a geared calendar movement is the oldest geared machine in existence in a complete state. It illustrates an important stage in the development of the various complex astronomical machines from which the mechanical clock d