166-195, by Messrs. Gano S. Dunn, Charles F. Scott, H. E. Heath, S. T. Dodd, Arthur Williams, Philip Lange, Charles Day, R. T. E. Lozier, N. W. Storer, H. Ward Leonard, Herbert Dowe, H. B. Coho, George A. Damon, R. W. Stovel, George B. Dusinberre, W. A. Dick, P. M. Lincoln, Campbell, Charles G. Winslow, E. M. Tingley, Stevenson, Barr, R. H. Pierce, Peter Junkersfeld, O. E. Osthoff, D. C. Jackson, B. J. Arnold, G. B. Foster, Ernest Gonzenbach, V. R. Lansingh, Harry H. Cutler, F. J. Pearson, and H. R. King. Relative merits of various methods of speed control of direct-current motors. Conditions which determine the choice between individual and group drive. Effects of motor drive and suitable speed control on shop efficiency. Advantages and disadvantages of the Ward-Leonard system of locomotive driven from single-phase circuits. METHODS OF SPEED CONTROL Wm. Cooper Vol. xx-1902, pp. 197-213 Outline of the general power requirements of the different classes of machine tools. Description of method of choosing proper size of motor for given service and speed range from a speed-horse-power diagram for combining multiple voltage and field regulation; numerical examples. Set of general rules for determining motor size. No discussion. POWER CONSUMPTION OF ELEVATORS OPERATED BY ALTERNATING Geo. F. Sever Vol. xix-1902, pp. 429-434 Records of tests on the comparative performances of direct-current and alternating-current motors in elevator service. Discussion, incorporated with that of paper by Charles M. Clark on "Telpherage." ELECTRIC MOTORS FOR CENTRIFUGAL PUMPS AND FANS August J. Bowie, Jr. Vol. xxii-1903, pp. 649-655 Power requirements and characteristics of centrifugal pumps under various conditions of operation. Discussion, pp. 656, by Messrs. H. G. Stott, and F. O. Blackwell. THE REQUIREMENTS FOR AN INDUCTION MOTOR FROM THE USER'S POINT OF VIEW Walter B. Nye Vol. xxix-1910, pp. 147-149 Brief mention of some of the conditions which must be met in the design of coils, bearings, shafts, pulleys and controllers so as to improve continuity of service and facilitate repairs. Discussion, including that of paper by Mr. Dugald C. Jackson on "The Applicability of Electrical Power to Industrial Establishments;" Mr. Charles T. Main's paper on "Central Stations Versus Isolated Plants for Textile Mills;" Mr. R. S. Hale's paper on "The Supply of Electrical Power for Industrial Establishments from Central Stations," and Mr. G. H. Stickney's paper on "Illumination for Industrial Plants"-pp. 150-182, by Messrs. J. C. Parker, Charles B. Burleigh, Norman T. Wilcox, H. B. Emerson, N. W. Dalton, H. W. Peck, R. D. DeWolf, Albert L. Pearson, H. D. James, C. A. Graves, J. H. Gardiner, and H. D. Jackson. General discussion of the relative advantages and disadvantages of central station and private plant energy supply, together with figures and experience from actual practice. Brief description of decentralized system of electrical energy production in which moderate size non-condensing turbo-electric stations supply both electricity and steam to consumers, the stations being inter-connected both by the electric and the steam distribution systems. ELECTRIC POWER IN THE CONSTRUCTION OF THE LOS ANGELES AQUEDUCT E. F. Scattergood Vol. xxix-1910, pp. 361-373 Description of the power plant and electrical equipment for the construction of a very long (240 miles) aqueduct, including power plant; transmission line and description of generating machinery; power shovels, dredges and locomotives. Costs of power plant and equipment. No discussion. Alber Milmow ELECTRIC DRIVE IN TEXTILE MILLS Vol. xxix-1910, pp. 385-422 Analytical discussion of electric drive of textile mills with energy purchased from water-power companies, comparing electric with steam operation as to first cost, cost of operation, and effect on production. The study includes a series of 50 recording tachometer records, showing the importance of close speed regulation and the effect of electric drive thereon. Discussion, pp. 423-427, by Messrs. Albert Milmow, Charles F. Scott, W. S. Lee, A. W. Henshaw, David B. Rushmore, and L. T. Robinson. General remarks and further information bearing on the effect of speed variations on production. Charles Fair MOTOR APPLICATION TO MACHINE TOOLS Vol. xxix-1910, pp. 621-647 Profusely illustrated discussion of the general principles underlying the application of motors to machine tools, with special reference to the choice and installation of apparatus for various kinds of machines. No discussion. HYDROELECTRIC POWER AS APPLIED TO IRRIGATION John Coffee Hays Vol.xxix-1910, pp. 731-753 Description of a large ground water system of irrigation (Mount Whiting Power Company in California) operated with hydro-electric energy, covering the power equipment; forms of contracts and charges; load characteristics; power requirements for different classes of work, and effect of irrigation on land values. Discussion, pp. 754-764, by Messrs. L. B. Stillwell, E. W. Paul, J. C. Hays, F. V. Henshaw, H. Homberger, L. Jorgensen, Ralph W. Pope, Markham Cheever, A. J. Bowie, Jr., W. A. Doble, and F. G. Baum. General discussion of the relative advantages of construction having limited life and construction which is practically permanent, also general remarks on irrigation. Louis Cohen 21. TELEPHONY AND TELEGRAPHY A. GENERAL THEORY INDUCTIVE DISTURBANCES IN TELEPHONE LINES Vol. xxvi-1907 pp. 1155-1167 Mathematical development of general equations for calculating the effects of electromagnetic induction, followed by equations for the special case of two parallel telephone circuits. No discussion. TELEGRAPH AND TELEPHONE SYSTEMS AS AFFECTED BY John B. Taylor Discussion, pp. 1216-1252, by Messrs. L. B. Stillwell, Charles F. Scott, A. W. Copely, W. S. Murray, Charles P. Steinmetz, L. C. Nicholson, J. C. Barclay, A. L. Cook, Frank F. Fowle, and A. S. Richey. Experience in operation of telephone and telegraph lines paralleling high-tension transmission lines and single-phase railways, and results obtained with neutralizing apparatus. Lieut. Col. Samuel Reber B. TELEPHONE SYSTEMS Vol. xix-1902, pp. 707-724 Scope of the duties of the Army Signal Corps. Telegraph and telephone construction in the field and in fortresses. Detailed description of signal apparatus used in the army. Discussion, incorporated with that of paper by Louis Bell on "Emergency Engineering for Harbor Defence." Chas. F. Scott THE TELEPHONE SWITCHBOARD Vol. xxi-1903, pp. 1-2 THE EVOLUTION OF THE TELEPHONE SWITCHBOARD. William D. Lockwood Vol. xxi, 1903, pp. 3-30 Historical outline of the development of the standard relay switchboard, with description of the circuits and mode of operation at different stages of development from 1877 to date. Discussion, incorporated with that of paper by William J. Hammer on "An Automatic Telephone Operator." AN AUTOMATIC TELEPHONE OPERATOR William J. Hammer General remarks on manual telephone exchange operation-service quality tests in New York; functions of telephone system compared with those of electric light plant; instruction of telephone operators; wire plant operation. Advantages of common battery over magneto telephone system. Simplification of standard relay board. SOME FEATURES OF TELEPHONE TRAFFIC AND THEIR EFFECT ON SERVICE J. G. Wray Vol. xxi-1903, pp. 73-80 Outline of the factors essential to good telephone service. Part played by the subscriber in determining quality of service, analysis of the traffic load curve in Chicago and other large cities. Efficiency of telephone plant. Brief description of the development and theory of the speaking arc, with experimental demonstration. No discussion. TELEPHONE ENGINEERING J. J. Carty Vol. XXV-1906, pp. 81-105 Description of functions of telephone engineer. Character and scope of telephone engineering. General outline of methods of telephone plant development in large city. Relation of commercial policy to telephone engineering. Discussion, pp. 106-112, by Messrs. Thomas D. Lockwood, S. S. Wheeler, Bancroft Gherardi, and C. P. Steinmetz. Some features of early telephone plant operation. Functions of traffic engineer. |