4 Blades Rotating Glass Windmill Solar Powered Crookes Radiometer Light Mill/Educational Teaching Study Tool Model No.: CR-60110BLT Products Category : School Science Teaching Materials > Crookes Radiometer INQUIRY Details See video as : Originally, designed by William Crooke in the 1860's, the radiometer still fascinates both young and old. The Crookes radiometer, also known as a light mill, consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity. The reason for the rotation was a cause of much scientific debate in the ten years following the invention of the device, but in 1879 the currently accepted explanation for the rotation was published. Today the device is mainly used in physics education as a demonstration of a heat engine run by light energy. It was invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research. In the course of very accurate quantitative chemical work, he was weighing samples in a partially evacuated chamber to reduce the effect of air currents, and noticed the weighings were disturbed when sunlight shone on the balance. Investigating this effect, he created the device named after him. It is still manufactured and sold as an educational aid or curiosity. Send Inquiry Name：* E-mail：* Tel： Content：* Verification Code：* (All * must be filled in) [ Previous：CR-60110GRT ] [ Next：CR-60110AMT ] Related Products Yellow Solar Power Radiometer Sun Light Energy Crookes Spinning Vanes Windmill Science Educatation Teaching tools for shool Physics expriement learning CR-T60190AMT (Twisted Base) Amber Solar Power Radiometer Crookes Solar Energy Spinning Vanes Windmill Gift Home Desk Decoration CR-O60100TAM yellow amber Solar Power Radiometer Crookes Solar Energy Spinning Vanes Windmill Gift Home Desk Decoration CR-75130AMT 4 Blades Rotating Glass Windmill Solar Powered Crookes Radiometer Light Mill/Educational Teaching Study Tool CR-60110GRT Blue Twisted Glass Base Solar Power Radiometer Sun Light Energy Crookes Spinning Vanes Windmill Gift Home Desk Decoration CR-T60190BLT (Twisted Base) Blue Hanging Solar Power Radiometer Crookes Solar Energy Spinning Vanes Windmill Gift Home Desk Decoration CR-O60100TBL Clear Glass Base Blue Solar Power Radiometer Sun Light Energy Crookes Spinning Vanes Windmill Teaching tools for shool Physics expriement learning CR-75215BLT Crookes Radiometer Solar Power Spinning Vanes Glass Windmill for Party Home Decoration GiftCrookes Radiometer Solar Power Spinning Vanes Glass Windmill for Party Home Decoration Gift CR-60110T
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