Mica windows for electronographic image tubes

Abstract
The curvature of and stress in rectangular and circular thin mica windows in a vacuum tube are analysed and it is shown that a circular window has advantages. A method of pressing an electron-sensitive Melinex-based emulsion against a circular window is described and the results of tests on actual windows are reported. Details are given of the method used for making a vacuum-tight seal between mica and chrome-iron.

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