People’s Magic Library
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 |  | Magic Books Exhibition - Panel 22 |  |  |
 | Mariano TOMATIS Volvelles (22 of 30) Volvelles are considered an early example of paper analog computers thanks to their ability to perform complex calculations. |
 | “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 22 | | |