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rose and white gold embedded in 14kt yellow gold
Invented in 1873 by chemist & experimenter Sir William Crookes
Butterfly specimen (Prothoe calydonia - verso - Malaysia) mounted behind glass on acid-free paper in a black wooden shadow box
a death mask was made
Solar Radiometer Size:Small rose and white gold embeddedInvented 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
