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Conect our Radiometer Tube to a high voltage power DC supply (best used with a Classic Induction or Ruhmkorff Coil) , and watch the mica paddle wheel spin in a cloud of cathode rays! As electrons, (a.k.a. cathode rays) are passed through the tube, the mica turbine inside begins to spin due to radiometric effect.
Our Classic Radiometer Tube demonstrates radiometric effect as a stream of cathode rays contact one side of the the paddle wheels vein. As electrons heat the turbine's surface, a small pocket of warm air is produced. This slightly warmer air is just enough to make rotational motion.
Everyone has seen a Light Mill or Radiometer in their science class room, but very few people realize that Sir. William Crookes developed the radiometer tube before he concieved the Light Mill.
Sir William Crookes began investigating vacuum tubes in the 1850's and soon developed unique innovations and stylings which took his name. Sir. Crookes' tubes are glass vessels containing low pressure air and electrodes meant to be connected to a high voltage power supply. The Crookes tube mimics what happens during the northern lights, electrons being passed through low pressure air.
During the turn of the last century, cathode ray tubes were a source of great entertainment for the average person, and led to the discovery of X-rays and the development of television.