Glass Radiometer with Blue Base - 16cm

Curious and mesmerising radiometer
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These curious and mesmerising instruments measure the power of electromagnetic radiation. Made from a glass bulb with much of the air removed to form a partial vacuum, inside is a set of fine metal vanes, each with one dark and one light side, mounted on a spindle. The vanes rotate, as if by magic, when exposed to sunlight, artificial light, or infrared radiation (even the heat of a hand nearby can be enough) – the more intense the light, the faster the rotation.

  • Measures the power of electromagnetic radiation
  • Fine metal vanes inside turn, as if by magic, when exposed to light or heat
  • Made of glass
  • Measures 16cm tall

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