In the preceding paper, electric stresses in elliptic cylindrical and oblate spheroidal gaseous cavities located in a dielectric contained between infinite plane parallel electrodes were calculated, using a technique devised by Rayleigh for solving the Laplace equation. The same methods give the maximum electric stresses at conducting surfaces of similar geometrical shapes located in the field between plane parallel electrodes, only very slight modifications to the equations developed previously being necessary. The formulas that have been derived in the present paper can be applied to calculate, for example, the maximum stress between successive turns of a long conducting helical coil subjected to a uniform voltage gradient and the maximum stress at the surface of the ellipsoid in an ellipsoidal voltmeter.