The solar radiometer, also known as a light mill, is an educational and physical demonstration object invented by English physicist Sir William Crookes (1832.1919) in 1873. This small physical-technical miracle shows you in a clear way how sunlight is converted into energy - the sun as an energy source of the future. The solar radiometer has become a technically interesting and entertaining object of modern living space and shows you every ray of sunlight by motion. The light mill is hand-blown and has a diameter of approx. 8 cm and a length with drops of approx. 18cm
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