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INTRODUCTORY 1 General
Early Experimental Work
Deflexion in a Transverse Magnetic Field
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accelerating potential angle anode aperture applied approximate atoms axial axis beta-ray calculated cathode cathode-ray tube chromatic coil component constant corresponding curve cylinder deflecting deflexion density diameter diffraction direction discussion effect electric field electron beam electron gun electron microscope electron optical electrostatic field electrostatic lens electrostatic lenses emission emitted employed energy equation equipotentials experimental expression field distribution field strength focal length focusing function give given Glaser grid hence image point increase integration ions Klemperer klystron Laplace's equation light optics lines magnetic field magnetic lens magnification method mirror negative normal obtained oscillations parallel paraxial particles path Phys plates pole-pieces positive principal planes produced radial distance radius ray-tracing refractive index result rotation scanning screen shown in Fig solution space charge spherical aberration surface symmetrical thermionic emission tion trajectories two-cylinder lens variation velocity voltage voltage ratio wave-length zero Zworykin