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Solar Radiometers Shop

Solar radiometers are also known as light mills because light moves their blades as opposed to wind for windmills. They consist of an airtight bulb containing a partial vacuum. Inside the glass bulb is a fine vertical spindle with a set of vanes mounted at the top. When the glass bulb is exposed to light, the weather vanes are propelled around, the speed of propulsion increases with the intensity of light, providing a qualitative way of measuring electronmagnetic radiation. These days the Solar radiometer, or Crooke's radiometer (named after Sir William Crooke who invented them), is more of a beautiful science gizmo than a means of accurate measurement. Our Solar Radiometer shop stocks a range of exquisite radiometers which make unusual and interesting gifts for scientists and science enthusiasts. For a great explanation of how radiometers work, check out the video.
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  1. Mr Sci Double Layer Radiometer

    Mr Sci Double Layer Radiometer

    When exposed to sunlight, vanes transfer heat to each one but not the same degree which causes the radiometer vanes to spin. Learn More
  2. Mr Sci Radiometer Large Amber

    Mr Sci Radiometer Large Amber

    It’s the spear powered by the sun! When light strikes the diamond wings it transfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster. Learn More
  3. Mr Sci Radiometer Large Blue

    Mr Sci Radiometer Large Blue

    It’s the spear powered by the sun! When light strikes the diamond wings it transfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster. Learn More
  4. Mr Sci Radiometer Large Green

    Mr Sci Radiometer Large Green

    It’s the spear powered by the sun! When light strikes the diamond wings it transfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster. Learn More
  5. Mr Sci Radiometer Small Amber

    Mr Sci Radiometer Small Amber

    It’s the spear powered by the sun! When light strikes the diamond wings it transfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster. Learn More
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