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Cathode Ray Tube


A black turned wooden base with a 17cm glass tube mounted vertically onto the wooden base. There is a curved electrode plate on the bottom of the glass tube and another electrode on the top of the glass tube.

Accession Number:

Alternative Name: Crookes tube; Vacuum Tube

Primary Materials: Metal, Wood, Glass

Markings: Old inventory number = phy65.

Dimensions (cm): Height = 25.5 cm, Diameter = 8.7 cm


Used to demonstrate the linearity of cathode rays through fluorescence.


Associated Instruments:


Likely made by Richard Muler-Uri (Braunschweig).

Date of Manufacture:


Additional Information and References:

Historical Notes:

If undisturbed by a magnetic field, cathode rays travel in straight lines. Due to the hemispherical curve of the cathode, the rays that emerge normal to the plane of their curve converge mid-beam, some distance away from the cathode.