People’s Magic Library
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 |  | Magic Books Exhibition - Panel 21 |  |  |
 | Mariano TOMATIS Volvelles (21 of 30) Volvelles are devices consisting in paper discs rotating on string pivots and surrounded by graduated or figured circles. |
 | “Experimentarius” Anonimo, Digby 46 1454. |
 | Federicus CHRYSOGONUS De modo collegiandi, pronosticandi, et curandi febres, nec non de humana felicitate ac denique de fluxu maris lucubrationes Venezia 1528.Federicus Chrysogonus' astronomical volvelle was used to predict tides by setting the position of the sun and the moon. |
 | Petrus APIAN Astronomicum Caesareum Ingolstadt 1540.Among the variety of pages with moving parts comes first and foremost a set of planetary equatoria, paper wheels for finding the places of the planets within the zodiac. Embodying all the details of the geocentric Ptolemaic system, the volvelles and threaded charts provide a remarkably accurate graphical calculation of a planet's position. |
| | Magic Books Exhibition - Panel 21 | | |