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Corona loss measurements were made on seven different conductor specimens. The losses were measured directly, on a three-phase line 700 ft. long, by means of three single-phase high-voltage wattmeters. The object of the test was to obtain data for the choice of conductor to be used on a 220-kv. 60-cycle line. The results show the effect of weathering of conductors, the comparison of conductors of two different diameters, the effect of size of strands and the method of stranding and also the effect on new conductors of the change in surface conditions caused by rain and washing.