Abstract
The relation Jn′(x)Nn′(kx)−Jn′(kx)Nn′(x)=0 arises in certain resonant cavity problems having cylindrical symmetry. The first roots of this relation are presented here as a function of k for n = 1, 2, 3, 4. The M'Mahon relation does not allow calculation of the first roots despite statements to the contrary in several places. It is shown that the functions Jn′(x)/Nn′(x) have relative maxima at x = n except for n = 0.

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