Crookes Tube, Fluorescence (Shadow) Effect
This tube has the cathode at the small end, with a Maltese cross that can be set vertically or horizontally. The aluminum cross will cast a shadow on the larger fluorescent end of the tube.
The Crookes tube running off a Ruhmkorff coil.  The gap at the top of the coil is set to limit the voltage produced by the coil, thus limiting the energy of the x-rays produced by the tube. Go here for more pictures of the tube in operation.
The cathode.
The anode.
"Made in Germany"
"Central Scientific Co. Scientific Instruments CENCO Laboratory Apparatus Chicago U.S.A. New York - Boston - Toronto - Los Angeles"


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