Cathode ray tube with coral
Accession Number: 2009.ph.245
A large pear shaped glass bulb is attached vertically to a turned wooden base. There is a tall glass arm or stand inside of the bulb which holds a pink mineral, likely coral. Near the bottom of the bulb, a perpendicular glass tube containing an electrode projects outward. At the top of the inside of the main glass bulb is another electrode with a metal disk attached via a short metal rod.
Alternative Name: Crookes Tube with coral
Primary Materials: Wood, Metal, Glass
Markings: Old inventory number = phy26.
Dimensions (cm): Height = 51 cm, Diameter = 12.5 cm
Coral fluoresces under bombardment of cathode rays. Possibly used for spectroscopy.
Date of Manufacture: