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American Institute of Electrical Engineers, Transactions of the

Issue 12 • Date Dec. 1934

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Displaying Results 1 - 25 of 47
  • List of Contributors

    Page(s): 1561
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  • Table of contents

    Page(s): 1561 - 1562
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  • 1935 Transactions

    Page(s): 1562
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  • Mapping of Fields

    Page(s): 1563 - 1570
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    Field theory, as contradistinct to circuit theory, is shown in this article to become increasingly important in a large number of engineering problems. In addition to the more familiar electric and magnetic fields there are temperature, mechanical stress, hydraulic flow, and other field concepts all reducible to the same mathematical basis. An outline of some of the methods employed in dealing with stationary fields is presented in this paper, conjugate functional methods and conformal representation being considered in detail, preceded by a brief consideration of experimental reproduction, graphical mapping, and mathematical solutions of field problems. This is the twelfth of a series of special articles developed under the sponsorship of the A.I.E.E. committee on education. View full abstract»

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  • Characteristics of a Group of Engineers

    Page(s): 1571 - 1576
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    An analysis of the characteristics of a group of development and research engineers is presented in this paper. From this analysis an attempt is made to point out the weaknesses that were responsible for some men being released during this period of abnormal business conditions, and, conversely, to show the elements of strength that permitted others to be retained. Such an analysis should be helpful not only to the young engineer entering industry and to the teachers who have prepared him, but also to his employers. View full abstract»

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  • Ratings of Industrial Electronic Tubes

    Page(s): 1577 - 1580
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    To serve as a guide in the standardization of of electronic tubes, the principal factors involved in the choice of tube ratings together with the more important terms commonly used, are presented in this paper. High vacuum tubes, gas and vapor filled tubes, and photo-electric tubes are considered separately, and the large number of factors which enter into the ratings of each of these 3 classes of tubes are discussed. View full abstract»

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  • Resistance and Reactance of 3-Conductor Cables

    Page(s): 1581 - 1589
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    The resistance and reactance of 3-conductor cables under balanced 3-phase loads have been studied in a series of tests in different laboratories, and the results are presented in this paper. Values of these constants are given for different types and sizes of 3-conductor cable, and the effects on the constants of several different factors are presented. View full abstract»

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  • On the Schooling of Engineers

    Page(s): 1589 - 1591
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    Two types of students, one fundamentaly interested only in engineering, and the other more deeply interested in and capable of leadership, are considered in this paper. For both, a broader training in the humanities is urged. Among the numerous points which it is stated should be brought to the attention of the student engineer is the necessity of realizing that human relatoniships, which cannot be reduced to a science, are among the most important considerations in later life. View full abstract»

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  • Coaxial Communication Transmission Lines

    Page(s): 1592 - 1593
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    A nonmathematical discussion of the mechanism whereby energy may be transmitted over long distances at high frequencies by the use of ``coaxial conductors'' is presented in this paper. A coaxial system consists of a cylindrical conducting tube within which a smaller conductor is coaxially placed. Such conductors, which reduce interference and cross-talk are applicable for the transmission of telephone, telegraph, and television signals over a very wide range of frequencies. View full abstract»

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  • Recommended Transformer Standards

    Page(s): 1594 - 1597
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    A brief review of several important revisions and extensions of the A.I.E.E. standards for transformers recommended by the A.I.E.E. transformer subcommittee is presented herewith, in order that those interested may have an opportunity to become familiar with these recommendations and to offer helpful criticism before action on final standards is taken. View full abstract»

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  • Loading a Bank or Dissimilar Transformers

    Page(s): 1597 - 1598
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    Formulas For determining the unbalance in load of 3 dissimilar single phase transformers operating 3 phase, delta-delta connected. View full abstract»

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  • Control of Transients in Welding Generators

    Page(s): 1598 - 1602
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    The fundamentals of d-c arc welding generators are reviewed in this paper, and the effect of transient current and voltages upon performance is described. It is then shown how the transients may be controlled by internal arrangements which reduce the induced voltages in the stator circuit and at the same time increase the series reactance of both the field and armature circuits. A new welding generator designed with these features is next described; it is a modification of the split pole type of self-excited machine. Also, comments on the technique of testing welding generators are presented. View full abstract»

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  • Measurement of Noise From Power Transformers

    Page(s): 1603 - 1608
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    From the results of an investigation on a typical large electric power system it is concluded that the specification of tolerable noise in transformers by means of measurements with commercially available noise meters is entirely practicable. The problems involved in this investigation and the principal results obtained are presented and discussed in this paper. View full abstract»

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  • Cathode Ray Tubes and Their Application

    Page(s): 1608 - 1615
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    Several distinctive types of cathode ray tubes are described In ths paper, starting with a brief description of the Braun type and followed by more detailed descriptions of recently developed types. The characteristics, the selection for a given application, and the operation of sealed-off gas-focused types and of high vacuum types are discussed. Also auxiliary apparatus is considered; and applications of cathode ray tubes are suggested briefly. View full abstract»

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  • Effect of Overloads on Transformer Life

    Page(s): 1616 - 1621
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    Efects of overloading on the life of oilimmersed self-cooled power transformers are discussed in this paper. Experience has shown that under average loads and ambient temperatures, a transformer rated for a temperature rise of 55 degrees C, has a very long life, and can be overloaded considerably for short periods with little loss in life. View full abstract»

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  • A Thermionic-Tube Measuring Instrument

    Page(s): 1621 - 1623
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    A universal measuring instrument for communication circuits has been developed which has a number of advantages over previous methods of obtaining measurements in such circuits. This thermionictube instrument gives direct measurements of current, voltage, power factor, or power in communication circuits and is accurate over a wide range ot frequencies. View full abstract»

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  • Measurement of Noise From Small Motors

    Page(s): 1624 - 1628
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    An analysis and summary of some of the concrete problems and considerations involved in the measurement of noise caused by fractional horse power motors are presented in this paper. Some experimental data and several important conclusions are given, but much remains to be done befoe standardization is possible. Desirable characteristics of a noise meter for this application tion are pointed out. View full abstract»

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  • Efficiency Tests of Induction Machines

    Page(s): 1628 - 1632
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    Several different types of tests For the efficiency of induction machines are discussed in this paper, and results obtained by the different methods are compared. The procedure involved in making the different types of tests is given in detail. In the determination of losses, special attention is given to the stray load loss, which, in most previous tests, has not been considered. View full abstract»

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  • Multiple Lightning Strokes

    Page(s): 1633 - 1637
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    Multiple lightning strokes have long been known to exist, but so far instruments for recording the successive discharges on electric power lines have not been available. The application of expulsion protective gaps to 3 typical transmission lines, however, has made a partial Investigation possible, with the aid of the automatic oscillograph. The results of this investigation are presented herewith. As many as 12 successive discharges have been recorded in a single stroke; these discharges have been as close together as 1 cycle (on a 60 cycle system) and as far apart as 9.5 cycles. View full abstract»

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  • Impulse and 60 Cycle Strength of Air

    Page(s): 1638 - 1645
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    The effect that the shape of electrodes has on the dielectric strength of air when subjected to impulse and 60 cycle voltage waves is considered in this paper. Principal attention is given to rod and plate electrodes and to sphere and plate electrodes, comparative data on the different types being given. Among other factors, the effect of polarity on breakdown voltage is brought out. These data on strength of air between various electrode shapes are correlated into working principles and presented from the standpoint of the design engineer interested in their application. View full abstract»

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  • News of Institute and related activities

    Page(s): 1662 - 1678
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  • Letters to the Editor

    Page(s): 1678 - 1686
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  • Membership

    Page(s): 1686 - 1687
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  • Engineering Literature

    Page(s): 1687
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