Preface

The 1950 TRANSACTIONS (volume 69) of the American Institute of Electrical Engineers will be published in two parts. Part I contains technical program papers and related discussions presented at the Winter General Meeting, New York, NY., January 30-February 3, 1950. Part II of the 195( volume will contain approved papers and related discussions presented at the following meetings: North Eastern District Meeting, Providence, R. I., April 26-28, 1950; Great Lakes District Meeting, Jackson, Mich., MIay 11-12, 1950; Summer and Pacific General Meeting, Pasadena, Calif., June 12-16, 1950; Middle Eastern District M%Ieeting, Baltimore, MId., October 3-5, 1950; Fall General Meeting, Oklahoma City, Okla., October 23-27, 1950. Full correlation of all material in this volume lhas been accomplished by means of the multientry index beginning on page 664. Reference to any of the several subject entries for a technical paper will lead directly to the paper and to any published discussion on that paper. The original number assigned each paper by the Technical Program Committee is given in the author index. Statements and opinions given in papers and discussions published in TRANSACTIONS are the expressions of contributors for which the American Institute of Electrical Engineers assumes no responsibility. Part II of Volume 69 is expected to be available for distribution early in 1951.