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anode aperture atom axis bacteria Braun tube cathode ray tubes cathode stream cell coil Courtesy University crystals developed diameter diatom diffraction direction disk distance elec electric field electromagnetic electron beam electron lens electron lenses electron micro electron micrographs electron microscope electron optics electrostatic electron microscope emitted energy equipotential ether experimental experiments filament film fluorescent screen focal length focus focussing glass illumination indicated J. J. Thomson Laboratories light beam lines of force magnetic electron microscope magnetic field magnetic lens magnification medium metal molecules moving negative object observed obtained oxide particles path photoelectric photoelectric effect photographic plate Physik plane pole Prebus produced refraction replica resolving power right angles shown shows silver bromide solenoid space specimen spherical straight line structure tion tobacco mosaic virus tron University of Toronto vacuum vector velocity virus voltage volts wave length wave motion wire Zeits