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Crookes tube, c 1888.

Crookes tube, c 1888.
4 0 c m
actual image size: 13cm x 32cm


This tube, made in William Crooke's (1832-1919) laboratory, was used for investigating the deflection of cathode rays by a magnet. It is similar to the one used by him a few years earlier to investigate the behaviour of cathode rays in a magnetic field. When the tube is connected to a very high voltage a narrow beam of cathode rays travels acros the tube, producing a glowing green line on the fluorescent screen in the tube. The line bends when a magnet is brought near the tube, showing that the cathode rays are deflected by a magnetic field.

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© Science Museum / Science & Society Picture Library

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