. The electron microscope, its development, present performance and future possibilities . Fig. 40. Potential and trajectories in electrostatic lenses The space charge lens is essentially a cylindrical magnetron, but with the important difference that it contains no axial cathode. Its main parts are a long coil, which produces, at least in the middle part, a nearly homogeneous magnetic field, a tubular anode or sheath electrode *'A," and a cathode "C," which is a filament, bent to a coaxial circle. The currents are

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