Chairman. HORATIO A. FOSTER. Law Committee. Board of Examiners. W. G. CARLTON, Chairman. ALBERT F. GANZ. W. I. SLICHTER. PERCY H. THOMAS. Standards Committee. A. E. KENNELLY, Chairman. Secretary. FREDERICK BEDELL. HENRY W. FISHER. Chairman. BENJAMIN G. LAMME. CHARLES L. CLARKE. Sections Committee. P. M. LINCOLN, Chairman. Chairmen of all Sections SPECIAL COMMITTEES Chairman. EDWIN BRITTON KATTE, ROBERT GIVEN BLACK. JESSE HOOD DAVIS. CARY T. HUTCHINSON. WILLIAM S. MURRAY. Educational Committee. JOHN PRICE JACKSON, Chairman. WILLIAM L. ABBOTT. RALPH D. MERSHON. High Tension Transmission DAVID B. RUSHMORE, Chairman. FRANK GEORGE BAUM. ARTHUR C. BUNKER. CUMMINGS C. CHESNEY. WILLIAM S. LEE. RALPH D. MERSHON. HAROLD PENDER. HARRIS J. RYAN. HAROLD PENDER. WILLIAM H. POWELL. CHARLES ROBBINS. EDWARD B. ROSA. CHARLES F. SCOTT. Library Committee. SAMUEL SHELDON, Chairman. FREDERICK BEDELL. MORGAN BROOKS. O. A. KENYON. Electrochemical Committee. PHILIP PRICE BARTON. JOHN H. MORECROFT. Power Station Committee. Public Policy Committee. CHARLES W. STONE. Additional Grade of Membership Committee. PERCY H. THOMAS, Chairman. BANCROFT GHERARDI. PAUL M. LINCOLN. ADDAMS S. MCALLISTER. CHARLES W. STONE. CALVERT TOWNLEY, Electrophysics Committee. MALCOLM MACLAREN. HAROLD PENDER. International Electrotechnical Commission. United States National Com mittee. Historical Museum Committee. Edison Medal Committee. JOHN WILLIAM LIEB, JR. C. O. MAILLOUX, President. CHARLES A. TERRY. Secretary. COMFORT A. ADAMS. Elected by the Board of Directors PERCY H. THOMAS. Ex-officio Members. Term expires July 31, 1912. Sections and their Secretaries LOS ANGELES PORTLAND, ORE. Pacific Tel. & Tel. Co., SAN FRANCISCO 819 Rialto Bldg., San Francisco, Cal. Mexico, D. F. ST. LOUIS MILWAUKEE MINNESOTA Leo H. Cooper, 805 Metropolitan Life Bldg., Minneapolis, Minn. PHILADELPHIA H. F. Sanville, 1326 Chestnut St.. PITTSBURG E. L. Farrar, G. E. Co., Oliver Bldg., University of Maine, Orono, Maine. ROSE INST. BUCKNELL UNIVERSITY Robert L. Rooke, Bucknell University, CALIFORNIA, UNIV. OF C. I. Kephart, University of California. CASE SCHOOL, LAND CLEVE CINCINNATI, UNIV. OF Oscar Plueddemann, 3133 Hackberry Street, Cincinnati, O. COLORADO STATE AGRICULTURAL COLLEGE A. A. Catin, 626 So. Meldrum St., Fort Collins, Colo. COLORADO, UNIV. OF Seizo Uyeda, University of Colorado IOWA STATE COLLEGE F. A. Robbins, Iowa State College, MICHIGAN, UNIV. OF Univ. of Michigan, MISSOURI, UNIV. OF 9 Engineering Building, MONTANA STATE COL. Montana State College, NEBRASKA, UNIV. OF Lincoln, Nebraska. NEW HAMPSHIRE COL. New Hampshire College, Durham, N. H. NORTH CAROLINA COL. OF AGR. AND MECH. ARTS W. H. Graham, N. C. Col. of A. & M. Arts West Raleigh, N. C. OHIO NORTHERN UNIV. J. E. Wineland, Ohio Northern University Iowa City, Ia. Kansas State Agric. Col., KANSAS, UNIV. OF M. H. Hobbs, University of Kansas, KENTUCKY, STATE UNIV Ohio State University, Columbus, Ohio. OKLAHOMA AGRICULTURAL AND MECH COLL. H. P. Cook, Oklahoma A. & M. Coll., Stillwater, Okla. OREGON STATE AGR. Institute Representatives On Board of Award, John Fritz Medal. LOUIS A. FERGUSON. WALTER S. RUGG. Troy, N. Y. POLYTECHNIC David W. Jones, 911 North 8th Street, STANFORD UNIV. Stanford University, California. Washington University, WORCESTER POLY. INST. Worcester Poly. Inst., YALE UNIVERSITY New Haven, Conn. DUGALD C. JACKSON, On Board of Trustees, United Engineering Society. HOWEL H. BARNES, JR. On Joint Committee on Engineering Education. CHARLES F. SCOTT. On Resuscitation Commission. ARTHUR E. KENNELLY. ELIHU THOMSON. On Electrical Committee of National Fire Protection Association. The Chairman of the Institute Code Committee, GEORGE FRANCIS SEVER. On American Year-Book. EDWARD CALDWELL. On Council of American Association for the Advancement of Science. On Conference Committee of National Engineering Societies. JOHN J. CARTY. CALVERT TOWNLEY. CONTENTS. MEETING AT PITTSBURGH, JANUARY 9, 1912. Central Station Power in Coal Mines-By W. A. Thomas. (Il- MEETING AT NEW YORK, JANUARY 12, 1912. Some Notes on Isolated Plants By Percival R. Moses. (Il- Discussion by R. P. Bolton, John C. Parker, Arthur Will- iams, George W. Martin, Charles K. Nichols, John W. Lieb, Jr., S. N. Clarkson, Clarence P. Fowler and P. R. Moses... MEETING AT PITTSFIELD, JANUARY 18, 1912. Central Station Electric Power for Railroad Operation-By Freder- MEETING AT NEW YORK, FEBRUARY 9, 1912. MEETING AT BOSTON, FEBRUARY 21, 1912. The Relative Costs and Operating Efficiencies of Polyphase and Single-Phase Generating and Transmitting Systems-By Discussion by W. C. Smith, C. M. Green, B. A. Behrend, Dugald C. Jackson, A. E. Kennelly, C. T. Mosman, W. S. Murray, Edgar Knowlton, John B. Sparks, Roger T. Smith MEETING AT NEW YORK, MARCH 8, 1912. Some Problems of High-Voltage Transmissions By Charles P. Characteristics of Protective Relays By E. M. Hewlett. (Il- Discussion by David B. Rushmore, C. S. Ruffner, F. W. Peek, Jr., Percy H. Thomas, A. E. Kennelly, A. S. McAllister, Farley Osgood, C. O. Mailloux, C. C. Badeau, Charles W. Stone, E. M. Hewlett, G. A. Burnham and E. A. Lof..... MEETING AT BALTIMORE, MARCH 27, 1912. Economies in Railway Operation By F. E. Wynne. (Illustrated.). MEETING AT NEW YORK, APRIL 5, 1912. The Relation of Central Station Generation to Railway Electrifica- tion By Samuel Insull. (Illustrated.). Discussion at New York, John W. Lieb, Jr., Dugald C. Jackson, Charles P. Steinmetz, Lewis B. Stillwell, Benjamin F. Wood, Cary T. Hutchinson, Bion J. Arnold, Frank J. Sprague, Hans Lippelt and Samuel Insull. Discussion at Boston, June 26, 1912, by Frank J. Sprague, H. G. Stott, William McClellan, Percy H. Thomas, W. G. Carlton, Calvert Townley, S. D. Sprong, W. S. Lee, W. S. Murray, William B. Jackson, Lee H. Parker, C. O. Mailloux, 81 101 175 viii MEETING AT PHILADELPHIA, APRIL 8, 1912. Some Features of the Outdoor Electrical Installation By F. C. MEETING AT PORTLAND, ORE., APRIL 16 TO 20, 1912. Arc vs. Tungsten Street-Lighting in Small Towns By C. E. Discussion by Gano Dunn, S. C. Lindsay, F. H. Murphy, A. A. Miller, H. M. Friendly, G. R. Cooley, W. A. Hillebrand, R. Howes, George H. Sampson, J. B. Fisken, Alexander Mar- tin, O. B. Coldwell, Lloyd D. Gilbert, A. G. Jones, L. B. Automatic Private Branch Exchange Development in San Fran- cisco By Gerald Deakin. (Illustrated.).. Discussion by H. M. Friendly, A. H. Griswold, A. H. Dyson, D. P. Fullerton, R. W. Pope, A. E. Burghduff, W. Lee Camp- bell, Lloyd D. Gilbert, Gerald Deakin and Arthur Bessey The Application of Automatic Selecting Devices to Telephone Multiple Switchboards By Alfred H. Dyson. (Illustrated.).. Discussion by A. H. Griswold, A. H. Dyson, Gerald Deakin, H. M. Friendly, A. E. Burghduff, Arthur Bessey Smith... Design of Telephone Pole Lines for Conditions West of the Rocky Discussion by H. Y. Hall, Gerald Deakin, W. D. A. Peaslee, Gano Dunn, D. P. Fullerton, P. M. Downing, S. J. Lisberger, Operation of Two Alternating-Current Stations Through Parallel P. M. Downing, W. A. Hillebrand, Lester McKenney, J. W. 449 Discussion by Gano Dunn, S. J. Lisberger, R. Howes, J. B. Fisken, L. F. Harza, O. B. Coldwell, H. Y. Hall and J. D. Ross. Practical Joint Pole Construction-By J. E. Macdonald. (Il- Discussion by A. H. Griswold, L. B. Cramer, Gano Dunn, O. B. Coldwell, S. J. Lisberger, H. R. Wakeman, J. B. Fisken, Air Gap Flux Distribution in Direct-Current Machines By Charles MEETING AT PITTSBURGH, APRIL 25 TO 27, 1912. Discussion by R. B. Williamson, F. D. Newbury, H. M. Gassman, A. M. Dudley, W. J. Foster, B. G. Lamme, Francis B. Crocker, C. P. Steinmetz, Bradley T. McCormick and Direct-Current and Alternating-Current Mill Motors for Auxiliary Drives By Brent Wiley. (Illustrated.). Discussion by Alexander C. Lanier, M. A. Whiting, R. B. Treat, Gano Dunn, F. R. Fishback, A. G. Ahrens and Brent Electric Braking of Induction Motors-By H. C. Specht. (Il- |