The field and lens constants are calculated for two typical magnetic lenses as used in electron microscopes, using the relaxation method developed by Southwell for the solution of potential problems The results are compared with those based on simple analytic approximations to the field distribution in the work of Glaser and Ramberg, and are shown to agree closely as regards those characteristics on which the discussion of the performance of the lens is based
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M. Hesse (1950) studied this question.
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