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CHAPTER PAGE 1 ELECTRICITY FLOWING IN A VACUUM
FROM EXPERIMENT TO APPLICATION
THE RECORDING BEAM
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actually alternating current amount amplifier tube anode anode current aperture application arrangement assume axis battery beam of electrons Braunian tube burning glass called camera cathode rays cause Chapter circuit condenser connected contour lines control grid curved cylindrical deflection plates device diagram diameter direction elec electric field electron beams electron lenses electron microscope electron tube electron-optics evacuated example Farnsworth flow of electrons fluorescent screen focal length focus frequency Geissler tube give gravitational hot cathode illumination image distance indicated in Fig instrument light rays light spot light-optics lines of force located luminous magnetic field magnification metal multipliers nearer negative numerical aperture object distance oblique obtained optical pass path photographic picture possible potential primary electrons produce radio tubes ratio reach the anode refractive result secondary electrons secondary emission shielding grid shown in Fig slit speed stop television tion trons variations voltage volts wave wavelength zero zone