Meco Mini Radiometer Light Mill Solar Power Sun Energy Clear Glass Spinning Vanes

Features: Invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research, the radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum. Inside the bulb, on a low friction spindle, is a rotor with several (usually four) vertical lightweight metal vanes spaced equally around the axis. The vanes are polished or white on one side and black on the other. This physical and technical miracle shows you in a clear way how sunlight is converted to energy. Specification: Material: Glass Color: Transparent Height: about 13cm(5.12") Diameter: about 7.5cm(2.95") Usage: Place near a window or under incandescent light and watch as the vanes rotate; The more light shine on the globe the faster the vanes rotates. Function: Decoration / Gift Package includes: 1 x Radiometer Light Mill Details pictures: