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American Institute of Electrical Engineers, Transactions of the

Issue 12 • Date Dec. 1936

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Displaying Results 1 - 23 of 23
  • List of Contributors

    Page(s): 1297
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  • Table of contents

    Page(s): 1297 - 1298
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  • In This Issue

    Page(s): 1298
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  • The Work of the Institute's Committees

    Page(s): 1299 - 1300
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  • Why the Engineer?

    Page(s): 1301 - 1303
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    The new conditions of life brought about by the material advances of recent times, which have been achieved primarily as a result of the work of scientists and engineers, have brought with them new and pressing problems??social, economic, political, and international. In this address,* Doctor Durand states that ``we (engineers) cannot evade the responsibility which rests upon us to take our due share, even the lead, in the study of the problems which our own activities have, in a large measure, developed.'' He urges ``a quickened sense on the part of the engineer, of his responsibilities, not alone in a purely professional sense, but as a citizen of his community, of his state, of his country, of the world.'' View full abstract»

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  • Some Lighting Features at the Great Lakes Exposition

    Page(s): 1304 - 1305
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  • Lightning Investigation on a 220-Kv System--II

    Page(s): 1306 - 1313
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    Further investigation of the lightning performance of the circuit formerly known as the Wallenpaupack-Siegfried line is reported in this paper, which presents measurements of structure currents as made by surge-crest ammeters and additional data on the effect of counterpoises and ground wires. View full abstract»

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  • Electronic Transient Visualizers

    Page(s): 1314 - 1318
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    Cathode-ray oscillographs, a few years ago found only in research laboratories, have become extremely useful tools in the hands of operating engineers, research technicians, and teachers alike; however the usefulness of cathode-ray oscillographs of the ordinary portable type is limited almost entirely to the observation of sustained periodic phenomena, and is of little use in the study of transients. Methods of extending the field of application of this instrument to include visual observation of circuit and line transients are presented in this paper. View full abstract»

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  • Calculation of Resistances to Ground

    Page(s): 1319 - 1328
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    Formulas for practical use in the calculation of the resistances from grounding conductors of variou forms to the earth are given in this paper and their use illustrated by examples. The accuracy of the formulas varies considerably, as discussed in the paper, but is sufficiently good that the methods should be helpful to those whose work involves problems of grounding. View full abstract»

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  • A-C Characteristics of Dielectrics-II

    Page(s): 1329 - 1337
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    Predetermination of the a-c characteristics of dielectrics by d-c measurements was discussed in an earlier paper.1 The present paper further shows that the method of 3 exponentials, although predicting accurately the in-phase component of current caused by reversible absorption, usually yields results of less than the true value in predicting the quadrature component. Charts are presented that reduce the computations required in the study of a great number of specimens. View full abstract»

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  • Currents and Potentials Along Leaky Ground-Return Conductors

    Page(s): 1338 - 1346
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    Current propagation and earth potentials for earth-return conductors with application to electric railway systems are discussed in this paper. General formulas are derived from which solutions may be obtained for problemes such as propagation of track currents and voltages, and earth potentials imposed on neighboring conductors. View full abstract»

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  • Calorimetric Measurement of Dielectric Losses in Solids

    Page(s): 1347 - 1356
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    A new transient calorimetric method for measurement of dielectric losses in solids at 10,000 volts and 1,000 kilocycles, is described in this paper and experimental data obtained by this method are presented. A steady-state method also is described and a direct comparison between the results obtained by the 2 methods is given. The absolute value of loss factor (0.0009) determined for quartz shows exact agreement between the 2 methods. The transient method is shown to reduce the time or making calorimetric measurements on solid materials from hours to minutes. Results of tests on 15 samples, including 6 different low-loss materials, show that the absolute values of losses in these particular materials are of the order of magnitude determined by previous low-voltage high-frequency measurements. It is thought that the transient calorimeter technique can be readily extended to ultra-high frequencies. View full abstract»

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  • Complex Vectors in 3-Phase Circuits

    Page(s): 1356 - 1364
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    To provide additional bridges between the fields of mathematics and electrical engineering is the main object of this paper, which is a sequel to a previous work on dyadic algebra. The paper includes an application of Gibbs's directional ellipse to 3-phase circuits, a treatment of symmetrical components by using the isoclinic unit vector and 2 circular complex vectors and an exposition of dyadics as appplied to in 3-phase symmetrical machines. View full abstract»

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  • Amplification Loci of Resistance-Capacitance Coupled Amplifiers

    Page(s): 1364 - 1371
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    This paper applies the method of circular loci to the determination of the vector amplifcation of resistance-capacitance coupled amplifiers. It is shown that the locus for both exact and approximate equivalent circuits is the sum of 2 circles, whereas for the approximate circuits at high or low frequency the locus is a single circle. The locus of vector amplification for this type of amplifier may be drawn directly from the circuit constants and the magnitude and phase angle of amplification at any frequency read directly. View full abstract»

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  • New Developments in Ignitron Welding Control

    Page(s): 1371 - 1378
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    In this paper the use of resistance-welding timers using igniter-type mercury-cathode tubes is reviewed briefly and a seam-welding control unit containing a new design of inductive timer is described, An ``ignition delay'' form of control of welding heat or current magnitude is presented in which one set of power tubes controls both current magnitude and time duration. Comparison is made with the tapchanging method; operation of several welding machines from one timer is discussed. View full abstract»

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  • Negative-Sequence Reactance of Synchronous Machines

    Page(s): 1378 - 1385
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    A theoretical analysis of the method proposed by the AIEE committee on electrical machinery for measuring the negative-sequence reactance of synchronous machines is presented in this paper. The analysis proves that the method leads to a correct measurement of the negative-sequence reactance for the operating condition most frequently met in applying the method of symmetrical components, but that the method of measurement does not determine the correct negative-sequence reactance of the machine for the operating conditions used in the proposed AIEE test. The results of experimental tests are given to verify the theory presented. View full abstract»

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  • News of Institute and related activities

    Page(s): 1388 - 1402
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  • Report of ECPD Committee on Professional Recognition Makes Far-Reaching Proposals

    Page(s): 1390
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  • Letters to the Editor

    Page(s): 1403 - 1407
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  • Membership

    Page(s): 1407
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  • Engineering Literature

    Page(s): 1407
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  • 1936 Index - Electrical Engineering and Transactions

    Page(s): 1408 - 1428
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