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Coolidge X-ray tube, 1913-1923.

Coolidge X-ray tube, 1913-1923.
3 5 c m
actual image size: 32cm x 27cm


Wilhelm Roentgen (1845-1923) was experimenting with cathode rays in 1895 when he noticed that his tubes could make a screen glow, even when there was something in the way. He had discovered X-rays. X-rays are emitted whenever fast-moving electrons are stopped in their tracks. Later X-ray tubes, like the one shown here, used a heated cathode.

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© Science Museum / Science & Society Picture Library

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