Cathode Ray Tube
Accession Number: 2009.ph.213
A turned black wooden base with a 16cm glass tube mounted on top of it. There is a semicylindrical electrode positioned vertically at the bottom of the main glass tube, facing up. There is an electrode on both ends of the glass tube.
Alternative Name: Crookes tube
Primary Materials: Metal, Wood, Glass
Markings: Old inventory number = phy66.
Dimensions (cm): Height = 25 cm, Diameter = 7.5 cm
Used to demonstrate the linearity of cathode rays. If undisturbed in by a magnetic field, cathode rays travel in straight lines. Due to the semicylindrical curve of the cathode, the plane of rays that emerge normal to the plane of their curve converge mid-beam, some distance away from the cathode.
Likely made by Richard Muller-Uri (Braunschweig).
Date of Manufacture:
Provenance: Collection of Dr. Martin Lee.