Crooke's Maltese Cross Tube
front/side view

Crooke's Maltese Cross Tube energized
front/side view

Crooke's Maltese Cross Tube
rear view

Crooke's Maltese Cross Tube energized
rear view

Probably the most famous Crookes tube, this conical shaped Crookes tube has a metal Maltese cross near its wider end.
When high voltage is applied between the cathode (narrow end of the tube) and the anode, the metal cross will obstruct the high speed electron flow. Electrons impacting on the glass cause it to fluoresce and those blocked by the cross produce a shadow on the end of the tube. This demonstrates the 'shadow effect' and fluorescence of glass.
The tube measures about 10" long and 3" in diameter (at the large end) and comes with a stand as shown.
Requires a high voltage DC power supply to operate.