Iron and brass demonstration planetary gear, blackened cast iron stability...

Iron and brass demonstration planetary gear, blackened cast iron stability base. A system of gears makes the earth and the moon turn around the sun simulated by a spark plug and a reflector. Table of seasons in polychrome paper.
The globe is signed R. BARBOT, geographer. Edited by IKELMER.
France, circa 1870.
Total length 58 cm.
A planetary is a mobile mechanical assembly, representing the Solar System (the Sun and its planets). The represented stars are animated, either manually or by a clockwork mechanism. These planets try to simulate reality for didactic or demonstration purposes. Automatically translated by DeepL. To see the original version, click here.