Abstract
An indirectly heated cathode is generally used as the electron source [1]. The electrons are emitted from an oxide coating on the tip of a small nickel cylinder sealed at one end. The coated tip is clearly shown in Fig. 2-1a as a white surface marked (k). The filament (f) or “heater” is reproduced in Fig. 2-1b, the cathode cylinder having been removed for this purpose. As can be seen, it is bent double. This is done to obtain maximum heating by the most economical means. To insulate it from the cathode, the filament is coated with a layer of kaolin. The filament can be heated by direct or alternating current.
First described by Prof. Braun in 1897 and called “Braun tube” after him. The term cathode ray tube is now usually employed.
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Czech, J. (1965). The Cathode Ray Tube. In: Oscilloscope Measuring Technique. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-39653-7_2
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