Abstract
MAY I supplement Mr. Campbell Swinton's letter in NATURE of June 26? The device of sliding a glass sleeve over the kathode for the purpose of varying the hardness of a discharge tube was also used and fully described by Wehnelt in 1903 (Deutsch. Phys. Gesell. Verh., 5, 14, p. 259), some five years after Mr. Swinton.
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