Discussion on “the electric strength of air — IV” (Whitehead), “the positive and negative corona and electrical precipitation” (Strong), “law of corona and dielectric strength of air” (Peek), and “an

C. F. Scott: The papers that have been presented are part of a series which have been appearing in our transactions, building up a new literature. It was, I believe, fifteen years ago when the first paper on this subject recorded a number of experiments and tests by Mr. Mershon on the lines of the Telluride Powder Company, in Colorado, and the tests were made jointly by the coöperation of Mr. Nunn of that Company, and Mr. Mershon and the company he represented. That paper presented the effect of these losses and the method of measuring them, and the success of the tests was largely owing to the ability and ingenuity of Mr. Mershon in meeting new requirements under particularly difficult conditions.