. The Bell System technical journal . TUBES SAME SIZE EQUIVALENTLENSES. CONCENTRIC TUBESFig. 1—Lines of force in typical electron lenses. TUBES DIFFERENT SIZES ^ techn. Physik, 17, 584-645, 1936. ■> E. Briiche and O. Scherzer, Geometrische Eledronenoptik (Springer, 1934).J. T. MacGregor-Morris and J. A. Henley, Cathode Ray Oscillography (Mono-graphs on Electrical Engineering), 1936. Maloff and Epstein, Electron Optics inTelevision (McGraw-Hill, 1938). ELECTROSTATIC ELECTRON-OPTICS 3 The theory of electron-optics is thus well established and anyfurther attempts at the subject must lea
. The Bell System technical journal . TUBES SAME SIZE EQUIVALENTLENSES. CONCENTRIC TUBESFig. 1—Lines of force in typical electron lenses. TUBES DIFFERENT SIZES ^ techn. Physik, 17, 584-645, 1936. ■> E. Briiche and O. Scherzer, Geometrische Eledronenoptik (Springer, 1934).J. T. MacGregor-Morris and J. A. Henley, Cathode Ray Oscillography (Mono-graphs on Electrical Engineering), 1936. Maloff and Epstein, Electron Optics inTelevision (McGraw-Hill, 1938). ELECTROSTATIC ELECTRON-OPTICS 3 The theory of electron-optics is thus well established and anyfurther attempts at the subject must lead to substantially the sameresults. There is, however, a need for a precise development of thetheory in a simpler manner. With this need in mind, the presentarticle approaches the subject in a manner that appeals to the readerwho is more familiar with electrical theory than he is with the conceptsof geometrical optics, and this approach leads clearly to the variousapproximations that are needed in the development of the the aid of two velocity functio
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