Solar Radiometer Size:Large Beetle specimen (Prionocalus cacicus

Beetle specimen (Prionocalus cacicus

Beetle specimen (Callipogon armillatus - Peru) mounted behind glass on acid-free paper in a black wooden shadow box

Arrangement of beetle specimens (Hoplia coerulea - Europe) mounted in a double-glass black wooden standing vitrine

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Solar Radiometer Size:Large Beetle specimen (Prionocalus cacicusInvented 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