The activities in research

Saratoga Springs, N. Y., June 23, 1925 D. W. Roper: I should like to suggest more fundamental research on the subject of high-voltage cables. During the past five or six years, the manufacturers in this country have made some wonderful improvements in their workmanship. They have increased the dielectric strength 60 percent in this period as shown by a summary of the record of three of the representative manufacturers. They have reduced the dielectric loss so that this dielectric loss, as the cable leaves the factory, is so low that failures from this cause cannot occur. But in reducing the dielectric loss, they have sacrificed the life of the insulation.