Cathode rays were deflected and focused in the median plane between a pair of similar coaxial solenoids Foci free of quadratic aberration were found at all pole separations and ratios of electron momentum to field strength, when the impact parameters of the electrons were suitably selected. This property would enable a spectrum to be photographed with fairly uniform quality over a considerable range of Hρ. The loci of these foci were found Values of the aberration coefficients and of the dispersion are given.
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Ehrenberg et al. (1952) studied this question.
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