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The equatorial plane radiation fields produced by a sinusoidal distribution of axial electric field along a half wavelength circumferential slot on a metallic cylinder of radius have been computed by means of an IBM-704 electronic computer. Radiation patterns in this plane are given for sizes of cylinder from . It is believed that these computations are the most accurate made to date for these patterns. From these patterns it is seen that as the cylinder increases in size, for a given wavelength, the patterns sharpen, and in the limit of infinite cylinder radius the patterns approach that from a slot on an infinite plane.