Licht, Waerme, Strahlen / Magnetismus, Elektrizitaet, Induktion / Daemonen und Geister

Licht, Waerme, Strahlen / Magnetismus, Elektrizitaet, Induktion / Daemonen und Geister

Cathode Ray Tube with Maltese Cross
Demonstration of the shadowing of cathode rays performed by Crookes, around 1893

Cathode rays are invisible in vacuum tubes, but generate a green glow when they strike the glass. The metal cross throws a cross-shaped shadow on the glass.

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