For demonstrating the straight propagation of electron beams in field-free spaces by projecting the shadow of a Maltese cross on a fluorescent screen. Also intended for observing the focussing of electron beams by magnetic fields as an introduction to electron optics. Comparison between the Maltese-cross shadows of electron beams and electromagnetic radiation (light).
The lower segment of the Maltese-cross has a hole with a diameter of 3 mm which makes it possible to ascertain the orientation of the cross' shadow under the influence of magnetic fields.
Heating: < 7.5 V AC/DC
Anode voltage: 2000 V to 5000 V
Anode current: typically 1.8 mA at 4000 V
Fluorescent screen: 85 mm Ø
Glass bulb: approx. 130 mm Ø
Total length: approx. 260 mm