Solar Radiometer Size:Large Each piece is unique and

Each piece is unique and sold separately

Stone measures 8mm across at widest point

H: approx 14cm

Choose an amount and give the recipient the ability to choose from our wide range of treasures for themselves

Vitrine dimensions: 19 x 15 x 3

Solar Radiometer Size:Large Each piece is unique andInvented in 1873 by chemist & experimenter Sir William Crookes, the solar radiometer was the first way in which man could demonstrate light as an energy source. The radiometer consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of metal vanes which are mounted on a spindle. When exposed to sunlight, artificial light, or infrared radiation, the vanes turn with no apparent motive power, the dark sides retreating from the