Cathode ray tube with five minerals
Accession Number: 2009.ph.28
A 26 cm glass bulb mounted on a wooden collar stemming from a wooden base. The bottom half of the bulb is narrow, 7 cm in diameter, and the top half is spherical, coming to a point with a metal (copper?) cover on top. Halfway up the first, narrow part of the bulb is a short, 5 cm projection with an electrode in it. Inside the large bulb are five different minerals secured in glass fixtures.
Alternative Name: Crookes tube; Fluorescing tube
Primary Materials: Metal, Wood, Glass
Markings: Old Inventory Number = phy76
Height = 35, Base Diameter = 14, Bulb Diameter = 14
Minerals fluoresce under bombardment of cathode rays. Possibly used for spectroscopy.
Date of Manufacture:
Likely built by Richard Muller-Uri (Braunschweig)