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William Crookes Bio

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William Crookes (1832 - 1919)

William Crookes (1832 - 1919)

Henry Smith Williams/A History of Science (1904)

William Crookes:

Crookes was an English chemist who discovered the element thallium.

Birth:

June 17, 1834 in London, England

Death:

April 4, 1919 in London, England

Claim to Fame:

Crookes was an English chemist who discovered the element thallium. He also discovered negative electrical cathodes in low pressure emit 'cathode rays' or a stream of fast moving electrons. The Crookes radiometer, sold in many museum gift shops and novelty stores was an accidental invention while trying to weigh out samples in a partially evacuated scale. He noticed the scale would move when struck by sunlight. He built the device to investigate this phenomenon.

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