[MANUSCRIT of Arithmetic, Geometry and Gnomonics] - Lot 3

[MANUSCRIT of Arithmetic, Geometry and Gnomonics] Tractabus Arithmeticus. In-8 bound in full shagreened basane, spine ribbed and ornamented, title page, some small leather tears, corners dulled. Late 17th-century manuscript, 440 numbered pages, written in black ink and illustrated with numerous figures, sometimes in red pencil, including 69 full-page figures, 7 fold-outs and 2 system figures. The text is sometimes in Latin, sometimes in French. Moisture mark on lower margin, with occasional loss of paper and a few letters. These include: Traités des Machines Hydroliques - De motu circulorum et rotarum artificiali pro horologiis rotatis (On the movement of artificial circles and wheels in revolving clocks) - Traité de la fabrique des orgues -Pour peindre en lettre d'or avec de la Purpurine - Varias tabulae pro calendario gregoriano (Various tables for the Gregorian calendar) - Describing a clock declining in light - Describing a clock declining in light. Descrire une horloge déclinant de l'horizon du midy au couchant - Descrire toute sorte d'horloge avec le compas de proportion - De horologis reflexo solum radio horus ostendentibus (About clocks reflecting only the radio indicating the hours) - De horologis radio recto et magneto solo horam indicantibus (About clocks telling the time by direct radio and by a magnet alone), etc.