Discussion on “compression chamber lightning arrester and the protection of distribution circuits” (Creighton and Shavor)

E. M. Hewlett: I am naturally interested in the development of the suspension insulator, which I first brought before the Institute in 1907, at the Niagara Falls meeting. The suspension insulators in their present form are giving excellent service at 110,000 volts and 140,000 volts. Having increased the radius of distribution to more than twice that practicable with the 60,000-volt pin insulator, which seemed to be the limiting factor, we learn from the operating engineers that these insulators are giving satisfaction. The step to 110,000 volts was made with less line trouble than the previous step, due to the higher mechanical and electrical safety factors.