Additional applications of the electrographic printing method in the testing of varnished insulation

Previously this group reported on the testing of salt-fog penetration and the failure, in heat endurance tests of varnished insulation, that is, on Coated fabrics and paper. The tests were based upon the use of the electrographic printing method which, has been described in the 1948 Annual Report of the Conference. The present paper is a progress report. It shows the application of the test method by using city current with suitable transformation by a bell transformer and a small selenium rectifier. (The scheme is attached).