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American Institute of Electrical Engineers, Transactions of the

Volume 54: 1935

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Displaying Results 1 - 25 of 25
  • Industrial Notes

    Publication Year: 1935 , Page(s): 1140
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  • Engineering Literature

    Publication Year: 1935 , Page(s): 1139
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  • Membership

    Publication Year: 1935 , Page(s): 1139
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  • Letters to the Editor

    Publication Year: 1935 , Page(s): 1127 - 1139
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  • Future AIEE Meetings

    Publication Year: 1935 , Page(s): 1125
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  • News of Institute and related activities

    Publication Year: 1935 , Page(s): 1122 - 1127
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  • Discussions of AIEE papers - as recommended for publication by Technical Committees

    Publication Year: 1935 , Page(s): 1105 - 1121
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  • The Production of Impulse Test Voltages

    Publication Year: 1935 , Page(s): 1100 - 1104
    Cited by:  Papers (4)
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    In performing surge tests on electrical power apparatus to determine ability to withstanding lightning or switching surges, the shape of the impulse voltage wave should be approximately the same as 1 of the 3 test wave shapes commonly in use. Methods of producing a wave shape having the prescribed time constants are described in this paper, and oscillograms are presented which show the correctness of calculated design characteristics of the generator for producing these surges. View full abstract»

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  • A Cathode Ray Oscillograph for Observing 2 Waves

    Publication Year: 1935 , Page(s): 1095 - 1100
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    A general purpose cathode ray oscillograph is described in this paper which embodies a cathode ray tube of high beam efficiency, a description of which has not hitherto been published. This tube makes it possible to use a high frequency oscillator for supplying both the beam and sweep voltages. An electronic switching circuit is described which greatly extends the usefulness of the cathode ray oscillograph by making it possible to portray simultaneously 2 or more different waves in their proper phase relation, provided both waves have frequencies which are in a simple multiple relationship to each other. View full abstract»

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  • Pyrochemical Behavior of Cellulose Insulation

    Publication Year: 1935 , Page(s): 1088 - 1094
    Cited by:  Papers (7)
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    Tests on unbleached unsized linen paper of high purity indicate that the physical defects implied by the various pyroelectric theories of insulation failure appear secondary to, and manifested as a result of, the chemical changes involved. These chemical changes result in both increased power factor and decreased dielectric strength of the insulation. The investigation shows that chemical results of overheating of cellulose insulation in service may be disastrous even within a range of temperatures not generally associated with dangerous physical effects. View full abstract»

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  • Control of Potential Over Insulator surfaces

    Publication Year: 1935 , Page(s): 1084 - 1087
    Cited by:  Papers (1)
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    To reduce radio interference caused by corona from pin insulators, adherent conducting coatings or films usually are applied to the central portions of the heads of the insulators, and metal thimbles or conducting coatings in the pin holes. By extending the coating to cover the entire head and by using a coating of the proper resistivity, the voltage at which corona occurs can be raised considerably without materially lowering the flashover voltage. This paper calls attention to the principle of controlling the potential distribution over surfaces of insulators by utilizing the resistance drop in potential resulting from the flow of charging current in high resistance films. View full abstract»

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  • A New Watt-Hour Meter

    Publication Year: 1935 , Page(s): 1073 - 1084
    Cited by:  Papers (1)
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    To meet the demand for sustained accuracy in watt-hour meters and for adaptability to service requirements, the meter described in this paper has been produced. It offers simplicity and interchangeability, light weight, high accuracy over a wide range of load, and convenience of adjustment, and features an improved overload compensator, a new form of full load adjustment, and a new form of combined open-potential-coil indicator and balance adjustment for polyphase meters. View full abstract»

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  • Split phase Starting of 3 Phase Motors

    Publication Year: 1935 , Page(s): 1068 - 1072
    Cited by:  Papers (1)
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    When 3 phase induction motors are to be operated from single phase lines, split phase starting is Frequently used. The optimum values of external resistance and reactance for split phase starting may be determined by the method of symmetrical components. In the present paper, equations For determining these values for each of the 2 commonly used split phase starting schemes are derived. The result of calculations based upon this method are shown to compare favorably with experimental data. View full abstract»

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  • A Static Thermionic Tube Frequency Changer

    Publication Year: 1935 , Page(s): 1063 - 1067
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    A 300 kva, synchronous type, 60-25 5/7 cycle static frequency changer, which was designed to be changed to a rectifier after the 25 cycle motor load has been replaced by 60 cycle motors, is described in this paper. The problems involved in the design of the control circuits are discussed in some detail, and the performance is described. View full abstract»

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  • The A-C Electrolytic Capacitor

    Publication Year: 1935 , Page(s): 1058 - 1063
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    The electrolytic capacitor for alternating current is coming into increased use, having recently been introduced for the starting of small single phase motors. Little is known of the film upon which its operation depends, but the general construction and characteristics of the capacitor are reviewed in this paper. The need for the development of testing procedure that will lead to an improved product is pointed out. View full abstract»

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  • Current Harmonics in Nonlinear Resistance Circuits

    Publication Year: 1935 , Page(s): 1055 - 1057
    Cited by:  Papers (5)
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    A semigraphical method of solving for harmonics in the input current to a network containing any number of linear and nonlinear resistances in any combination, when a sinusoidal voltage is applied across the network, is presented herewith. The treatment is restricted to nonlinear resistances in which the d-c volt-ampere characteristic is the same regardless of the direction of current. While the method has the errors inherent in any graphical solution, the results indicate good accuracy with little labor. View full abstract»

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  • Electrical Brush Wear

    Publication Year: 1935 , Page(s): 1050 - 1054
    Cited by:  Papers (6)
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    An investigation of the effects of polarity and current density on the rate of wear of electrical brushes is reported in this paper, following a brief review of previous experimental work in this field. For carbon and copper impregnated carbon brushes the rate of wear of the positive brush is considerably less than that of the negative brush, while for metallic brushes the situation is reversed. The rate of wear of metallic brushes was found to be much greater than that of carbon brushes, under conditions of these tests. While no complete explanation of brush wear can be derived from the results, the rate of wear seems to be related intimately to the conduction of current across the contact. View full abstract»

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  • Recent Electric Furnace Developments in Europe

    Publication Year: 1935 , Page(s): 1048 - 1050
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    A summary of progress during 1934 and part of 1935 In electric furnace developments in Europe has been prepared by D. F. Campbell, a leading authority on the electrometallurgical industry in Europe, at the request of the Institute's committee on electrochemistry and electrometallurgy. The summary is presented herewith for the information of the Institute's membership. View full abstract»

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  • Multielement Operation of the Cathode Ray Oscillograph

    Publication Year: 1935 , Page(s): 1045 - 1047
    Cited by:  Papers (1)
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    With the aid of specially designed auxiliary devices, the cathode ray oscillograph may be operated as a multielement instrument, in circuits that permit of the repeated application of the wave to be observed. The number of waves that may be traced with apparent simulataneity on the oscillograph screen is limited only by the complexity of the control circuit and the crowding of the various curves on the relatively small screen. View full abstract»

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  • Operational Method or Circuit Analysis

    Publication Year: 1935 , Page(s): 1037 - 1045
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    For that broad group of electrical engineers not familiar with Heaviside's operational method and its value in the analysis of electrical circuits, this article presents briefly some of the fundamental characteristics of the method and explains how it is applied; its application is illustrated by the formulation of operational equations for a few typical circuits. Although intended primarily to impart only the fundamentals of the subject to an engineer who has had ordinary mathematical training, it is hoped that the article also may serve as an introduction and guide to further study. View full abstract»

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  • Two Methods of Mapping Flux Lines

    Publication Year: 1935 , Page(s): 1032 - 1036
    Cited by:  Papers (1)
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    Two methods of magnetic and dielectric flux mapping by means of experimental models are described in this paper. Both methods use resistance models, through which current is passed; electrical conductivities of model parts are adjusted to correspond to magnetic or dielectric permeabilities of corresponding parts of the original design, and paths of electric current flow and electric equipotential lines in the model correspond to magnetic or dielectric flux lines and equipotential lines in the original design. Low melting point waxes with carbon or graphite inclusions are particularly suitable for model making purposes due to easy working properties and ready control of the electrical conductivity. View full abstract»

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  • The Engineer and the Modern World

    Publication Year: 1935 , Page(s): 1031 - 1032
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  • In This Issue

    Publication Year: 1935 , Page(s): 1030
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  • Table of contents

    Publication Year: 1935 , Page(s): 1029 - 1030
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  • List of Contributors

    Publication Year: 1935 , Page(s): 1029
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