Cathode ray tube with one mineral


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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 glass bulb which holds a large pink mineral with a blue underside. Nearer the bottom of the bulb is a perpendicular glass tube with an electrode inside it. At the top of the inside of the glass bulb is another electrode with a metal disk attached via a short metal rod.

Alternative Name: Crookes Tube with one mineral

Primary Materials: Wood, Metal, Glass

Markings: Old inventory number = phy79.

Dimensions (cm): Height = 40.5, Diameter = 15.5


Minerals fluoresce under bombardment of cathode rays. Possibly used for spectroscopy.


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