"[Volvelle]", Galluci, Giovanni Paolo
Subject: Cartographic Miscellany
Period: 1657 (published)
Publication: Theatro del Mundo ye del tiempo Granada
Color: Black & White
7 x 10 inches
17.8 x 25.4 cm
This wonderful device was used to solve problems concerning the calendar, tide tables, the rising and setting of the sun, moon, or stars, and the positions of planets. It consists of a separate movable paper disc, engraved with the signs of the zodiac, rotating on a red silk ribbon pivot in a graduated circle engraved with 30 divisions. These were included in scientific books and atlases and because of their delicate nature most have not survived in tact.
Fully functional, with original red silk ribbon. There is a light stain and chip in the upper margin, not affecting the text or volvelle.