Solar Radiometer Size:Small Tibet) mounted on acid-free paper

Tibet) mounted on acid-free paper in a black wooden shadow box

Engraved with the words 'Omnes Qui Errant Non Pereunt'

Invented in 1873 by chemist & experimenter Sir William Crookes

rose and white gold embedded in 14kt yellow gold

One of a kind hand-cut Peruvian opal set in claws of 14kt rose & white gold

Solar Radiometer Size:Small Tibet) mounted on acid-free paperInvented 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