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ID number:  BIRRC-P0101
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Probably Departmental glassblower
Title / Object name:  Discharge Tube with Paddle Wheel
Object type:  Physics instrument
Materials:  Glass with mica vanes on wooden block
Measurements:  23 x 9 x 5 cm
BIRRC-P0101b.jpg

This is a sealed glass vessel with electrodes at its ends. It will contain gas at low pressure so that it can sustain an electrical discharge. Inside is a paddlewheel with mica vanes that runs on a pair of glass rails. The purpose is to demonstrate that the electrons or ions in the discharge carry momentum and can turn the paddle so that it runs along its rails.

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