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accelerating voltage angle Angstrom units anode aperture Ardenne atoms axis bacteria cathode ray tube cell cellulose chromatic aberration coil condensing lens crystal deflection desk model detail diameter direction electron beam electron gun electron lenses electron microscope electron probe electrostatic lenses employed final image fluorescent screen focal length focus foil gauze hence high voltage instrument intensity investigated latter light microscope limit lines of force magnetic field magnetic lenses magnetic microscope magnification metal method micro microtome molecules o o o o o o o o o o o o o o o o o o objective lens obtained optical microscope ordinary oxide parallel particles photographs pole pole-pieces position possible produce projection replica resolution resolving power scanning microscope sections shadowgraph smaller specimen spherical aberration spot structure substances surface technique thickness tion vacuum viewing screen virus viruses visible wavelength X-ray X-ray microscope