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Over a period of about seven years, Subcommittee IV on Liquid Insulation of ASTM Committee D-9 on Electrical Insulating Materials has held a series of five symposia on insulating oils. These stemmed from a very active interest in the development of test methods and the evaluation of test results to be used in establishing the serviceability of new and used insulating oils. The first symposium was held at a meeting of Committee D-9 in October, 1946, in Atlantic City. Four papers provided a basis for a discussion on the possible significance of the steam emulsion number test, the interfacial tension test, and the analysis of dielectric strength data by statistical methods. The second program was held in June, 1947, at Atlantic City, during the ASTM 50th Annual Meeting. Again, four papers were presented for discussion, two on the use of inhibitors in transformer oils and two on the practical application of power factor tests on oils as a criterion of aging effects. The first two symposia were published in ASTM , No. 146, May, 1947, pp. 90 to 100, and No. 149, December, 1947, pp. 58 to 94. Both of these symposia also were printed in separate pamphlet form.
Schofield, L. B.
Materials EngineerChairman of Symposium committee, Commonwealth Edison Co., Chicago, Ill.