By Topic

Transactions of the American Institute of Electrical Engineers

Volume XXXVIII: 1919

Filter Results

Displaying Results 1 - 25 of 31
  • Synoptical and Topical Index of A.I.E.E. Transactions

    Publication Year: 1919, Page(s):1 - 46
    Request permission for commercial reuse | PDF file iconPDF (3901 KB)
    Freely Available from IEEE
  • Index

    Publication Year: 1919, Page(s):v - vii
    Request permission for commercial reuse | PDF file iconPDF (272 KB)
    Freely Available from IEEE
  • Report of the Board of Directors for the Fiscal Year Ending April 30, 1919

    Publication Year: 1919, Page(s):1759 - 1776
    Request permission for commercial reuse | PDF file iconPDF (1599 KB)
    Freely Available from IEEE
  • Starting Conditions of Synchronous Machines

    Publication Year: 1919, Page(s):1713 - 1757
    Cited by:  Papers (2)
    Request permission for commercial reuse | PDF file iconPDF (4015 KB)
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inherent Limitations on Transformations Possible by Stationary Apparatus

    Publication Year: 1919, Page(s):1697 - 1711
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1196 KB)

    Expressions for electrostatic and electromagnetic energies, Joulian heat dissipation and power are given in complex quantities. The pure imaginary part of the expression for power in a static network is shown to be equal to 2 ?? times the difference between the mean electromagnetic energy and mean electrostatic energy. Use is made of this new principle in considering the problems of power-factor c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some New Formulas for Reactance Coils

    Publication Year: 1919, Page(s):1675 - 1696
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1748 KB)

    Formulas are presented and derived, which have not been previously published, for mutual inductance of coils with parallel axes, repulsion of coils with parallel axes, and self-inductance of long cylindrical coils. These formulas apply to practically all cases of reactance coils in common use. They are very convergent and accurate, and will give results to a given degree of accuracy with a minimum... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some Problems in the Operation of Power Plants in Parallel

    Publication Year: 1919, Page(s):1651 - 1674
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2275 KB)

    In order to operate two power plants satisfactorily in parallel, the transmission line which ties them together must have sufficient synchronizing power, as well as sufficient carrying capacity. The ``synchronizing power'' of a line depends upon its resistance and reactance, the bus voltages maintained at its ends, and the maximum kilovolt-amperes it must transmit. The ability of different lines t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Unification of the Manual and Automatic Telephone Systems

    Publication Year: 1919, Page(s):1635 - 1650
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1811 KB)

    A description is given of the physical consolidation of the Bell manual and the Automatic Electric telephone systems of Los Angeles, Cal., which previously to June 1, 1918 operated as separate systems. While similar consolidations had been made previously they included relatively small volumes of traffic and afforded no engineering precedents as a guide to the consolidation of two systems serving ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Searchlight in the U. S. Navy

    Publication Year: 1919, Page(s):1605 - 1634
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8818 KB)

    The types and uses of searchlights and signaling lights on naval ships are briefly described. A changed form of 12-inch incandescent searchlight is suggested which will insure the lamp bulb filament always being at the focal point of the mirror and of the correct type for the application. The present type of low-power searchlight has many faults. These faults may be corrected by supporting the car... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Applicability of Automatic Switching to All Classes of Telephone Service

    Publication Year: 1919, Page(s):1567 - 1604
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4981 KB)

    This paper is an attempt to place before engineers general information in regard to automatic telephone switching. The subscriber's requirements are independent of the means used to satisfy them. Automatic switching is uniformly fast and involves reduced mental stress to the user because the passing of the number is positive and waiting time is reduced to the minimum. Viewed by the owner the appar... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Present Limits of Speed and Output of Single-Shaft Turbo Generators

    Publication Year: 1919, Page(s):1537 - 1565
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3476 KB)

    Output is determined broadly by rotor or stator dimensions. With speeds of 1200 rev. per min. and lower, the stator is the limiting member, while with higher speeds, the rotor is the limiting member. The most effective rotor diameter is not necessarily the largest diameter. To obtain maximum output at a given speed the rotor proportions must be chosen to properly balance mechanical stresses, rotor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Present Limits of Speed and Power of Single Shaft Curtis Steam Turbines

    Publication Year: 1919, Page(s):1527 - 1535
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    This paper starts by showing that the limit of a single-unit turbo generator does not lie in the generator but is confined to the steam turbine, and that the last wheel of the turbine is the limiting feature. The author therefore takes the last wheel of an 1800-rev. per min. turbine, giving dimension stresses, kind of material used etc., and then designs two turbines, one having 23 stages and the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Present Limits of Speed and Power of Single-Shaft Steam Turbines

    Publication Year: 1919, Page(s):1515 - 1525
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1688 KB)

    This paper will be restricted to a discussion of some of the factors which influence limits as applying particularly to turbines of the reaction type. With the employment of high vacua the limit of power will be determined largely by the area obtainable through the last stage. Limiting factors include: 1. Chosen maximum values of steam speed through the blades in order to keep the leaving losses w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Report on Electromagnetic Induction

    Publication Year: 1919, Page(s):1495 - 1513
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1918 KB)

    This report discusses briefly the chief fundamental results obtained from the days of Faraday to the present time in studying the electromotive forces ordinarily referred to the domain of electromagnetic induction. Self-induction is first taken up, and the phenomena of self-induction are treated. as essentially identical with the phenomena of inertia in dynamics, according to the idea of Maxwell a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Piezo Electric Effect in the Composite Rochelle Salt Crystal

    Publication Year: 1919, Page(s):1467 - 1493
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3230 KB)

    The piezo-electric effect is an electro-elastic property of certain crystals. It involves the conversion of mechanical into electrical energy, and also the converse effect. The paper presents an exposition of piezo-electricity and related optical and other properties belonging to these crystals. Special reference is made to the comparatively large piezo-electric effects produced by Rochelle salt c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Positions of Atoms in Metals

    Publication Year: 1919, Page(s):1445 - 1466
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3794 KB)

    When a narrow beam of X-rays passes through a fine powder of any crystalline material, it produces on a photographic plate placed just behind the powder a pattern of concentric circles. These circles are produced by the reflection of the X-rays from the planes of atoms in the crystal, and their diameters are a measure of the distances between these planes of atoms. By measuring the diameters of th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Vacuum Tube as a Generator of Alternating-Current Power

    Publication Year: 1919, Page(s):1415 - 1444
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8555 KB)

    The first part of this article deals with the operation of the tube when separately excited, the variation of power with the amount of excitation, the load impedance, etc., and also gives an analysis of the forms and phases of voltages and currents in the different parts of the circuit. The second part deals with the efficiency of the tube as a generator; the action is analyzed in detail and the c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Principles of Radio Transmission and Reception with Antenna and Coil Aerials

    Publication Year: 1919, Page(s):1347 - 1414
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6050 KB)

    Coil aerials are coming to replace the large antennas in radio work. The advantage of the coil aerial as a direction finder, interference preventer, reducer of strays and submarine aerial, make it important to know how effective such an aerial is as a transmitting and receiving device in comparison with the ordinary antenna. In this article the mathematical theory is presented and, as a result, th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Telephone Repeaters

    Publication Year: 1919, Page(s):1287 - 1345
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10472 KB)

    In this paper the authors have endeavored to set forth briefly but clearly the history of the research and development work which has led up to the final production of successful telephone repeaters. The various forms of amplifiers which have been suggested are described and their possibilities and limitations pointed out. The essential properties of repeater networks together with the necessary l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transoceanic Radio Communication

    Publication Year: 1919, Page(s):1269 - 1285
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3769 KB)

    The paper defines the state of the art of today which is the result of developments during the war. Transatlantic radio communication is at present maintained by five first class stations, two in America and three in Europe. These stations operate at wave-lengths between 12,500 and 17,000 meters. The range of wave-lengths suited for such traffic is rather limited, the desirable wave length being i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • California 220,000-Volt - 1100-Mile - 1,500,000-kw. Transmission Bus

    Publication Year: 1919, Page(s):1237 - 1268
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3787 KB)

    This paper summarizes the power resources of California and the probable loads to be supplied within the next six or seven years. For the purpose of economically distributing the necessary power and supplying the load, a long high-voltage transmission line is proposed. As this line would interconnect a number of different companies, it assumes the nature of a bus bar. The authors show how the prop... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Predetermination of Synchronous Phase-Modifier Performance

    Publication Year: 1919, Page(s):1223 - 1235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1228 KB)

    The author reviews the method for showing the behavior of transmission lines first given by Perrine and Baum and then shows how it can be used in determining the effect of the use of a synchronous motor operating without load for improving the power factor. The effect of the losses in the motor are shown both in their effect on the line alone and on the line with the step-up and step-down transfor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theory of Probabilities Applied to Failures of Suspension Insulators

    Publication Year: 1919, Page(s):1199 - 1222
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2651 KB)

    Nothwithstanding the recent improvements in porcelain insulators, failures are sufficiently common so that allowance must be made for them. A certain factor of safety is required, in the shape of extra insulation, to provide for the electrical unreliability of the insulators themselves aside from conditions of abnormal operating stresses. There are a wide variety of operating conditions which affe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Order and Amplitude of Harmonics in Voltage Wave Forms with Indicating Instruments

    Publication Year: 1919, Page(s):1179 - 1198
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3259 KB)

    The author presents a method for the determination of the order and percentage of the various components of an alternating wave of e. m. f., using indicating meters and other inexpensive apparatus. Two examples are given. Oscillograms are included to show interesting phenomena and to check the results of the calculations. The value of so-called standards for the indication of wave form is question... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Effect of Transient Voltages on Dielectrics II

    Publication Year: 1919, Page(s):1137 - 1177
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3377 KB)

    This paper treats of some of the practical applications resulting from an investigation of the effect of lightning voltages on insulators, bushings and protective gaps. There is a great difference in the relative lightning spark-over voltages of various gaps as well as a great difference in the setings imposed by operating conditions. Both of these factors must be considered in comparing the relat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.