The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Crookes Paddlewheel Tube I bought this beautiful tube in a former Technické Bazaar in Žizkov, Czech Republic. It was an incredible shop near Ohrada on the Tramvaj.  Down the street was Restaurace u Studaka that had awsome drst'kova polevka. The paddle wheel is made of mica painted with phosphorescent minerals. The fan rotates from bombardment. Here are some unusual experiments with a small Tesla Coil and Canal / Channel Ray Tube. (Kanalstrahlen auf deutsch).  These were never run on AC but here's what happens when they are. (There are other photos on the site of these operating on DC)