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THE ILLUMINATING SYSTEM
THE IMAGING SYSTEM
RECORDING THE IMAGE
13 other sections not shown
alignment aluminium angle angular aperture anode aperture astigmatism atoms axial axis beryllium bias biological Boersch Borries cathode Cavendish Laboratory centre chromatic aberration collodion condenser contrast corresponding defocusing density depth of field detail diffraction disk distance effect electron beam electron gun electron lenses electron microscope electrostatic electrostatic lens emission employed emulsion equation evaporation exposure field of view filament focal length focusing Formvar give given grid Hence high magnification high voltage illumination increase instrument intensity intermediate lens latter limit magnetic lenses magnification material maximum metal method Metropolitan Vickers micrograph normal object holder objective lens observed obtained operation optical microscope oxide particles photographic plane plate pole pieces possible practice projector pump range replica resolution resolving power rotation scattering shadowing shown in Figure specimen spherical aberration stage surface temperature thickness tion two-stage usually vacuum variation varying viewing screen visible