In testing the cables purchased under specifications, it was noted that at first the paper was not applied smoothly, that is, without wrinkles, and that difficulty was encountered by some manufacturers in applying the insulation so that it would pass the bending test. As these difficulties were brought to the attention of the manufacturers, it was found that it was not a serious matter to eliminate the difficulties by having the paper tape of the proper thickness and width and applied with a suitable tension and the right amount of lap. As these difficulties were eliminated, the dielectric strength test of the cables' increased, so that finally for such thicknesses of insulation as are common in this country for 25 kv. it was found that the voltage required to cause failure of the cable under the dielectric strength test was quite beyond the testing facilities available in practically all of the cable factories. It would thus appear that by suitable care and perhaps some additional inspection in the factories, the American cable manufacturers should be able to make their cable of more uniform quality so that it would give results more nearly corresponding to the available data on foreign cables.