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William Crookes (1832-1919)

William Crookes (1832-1919), a British scientist, was one of the discoverers of the cathode ray.

In 1887 Crooke’s experimented by putting a small metal cross in the path of the rays coming from the cathode. The cross cast a shadow on the glass screen beyond.

This demonstrated that rays came from a cathode, and that they traveled in straight lines, just a flashlight shining light rays onto the cross shape would cast a shadow behind it. This became the basis for television.

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