Atomic Physics and Related Subjects.: Communications to Nature.: Behaviour of Electrons in a Gas Tube

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THE late Mr. Campbell Swinton observed (Proc. Roy. Soc., 61, 79; 1897) that a carbon anticathode in a gas X-ray tube under certain conditions showed a ring of fluorescence which he considered due to the hollow nature of the cathode stream. The following preliminary account of some experiments with a gas X-ray tube of the Shearer type shows that the effect can be more complex than is usually suspected.

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