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Electrical Engineering

Issue 12  Part Supplement • Dec. 1938

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Displaying Results 1 - 17 of 17
  • [Front cover]

    Publication Year: 1938, Page(s): c1
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  • [Advertisement - Front inside cover]

    Publication Year: 1938, Page(s): c2
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  • Contents

    Publication Year: 1938, Page(s): 1
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  • A symbolic analysis of relay and switching circuits

    Publication Year: 1938, Page(s):713 - 723
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    IN THE CONTROL and protective circuits of complex electrical systems it is frequently necessary to make intricate interconnections of relay contacts and switches. Examples of these circuits occur in automatic telephone exchanges, industrial motor-control equipment, and in almost any circuits designed to perform complex operations automatically. In this paper a mathematical analysis of certain of t... View full abstract»

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  • Low-voltage fluorescent lamps

    Publication Year: 1938, Page(s):723 - 726
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1659 KB)

    FLUORESCENT lamps have been developed, simple in design, and operating through suitable ballast from 115- and 230-volt a-c circuits. They are tubular in form, and the fluorescent material is energized by a hot-cathode positive-column electric discharge. Just as a transformer converts one voltage to another, the fluorescent powder adhering to the inner wall of the bulb converts the invisible ultrav... View full abstract»

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  • Graphical field-plotting methods in engineering

    Publication Year: 1938, Page(s):727 - 732
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    IT IS THE OBJECT of this paper to exhibit the great range of problems, often very difficult analytically, which can be solved with comparative ease by graphical means. The paper is based on several lectures presented to the electrical and mechanical sections of the advanced course in engineering of the General Electric Company. Due to lack of space the theory will be presented rather briefly, thou... View full abstract»

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  • Stability characteristics of turbine generators

    Publication Year: 1938, Page(s):732 - 744
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    IT IS believed that many worth-while savings and improvements can be obtained by considering more carefully than has been done in the past, what constitutes rational turbine-generator stability requirements. Keeping this objective in view, this paper reviews and analyzes the steady-state stability characteristics of turbine generators taking the effects of saturation into account. View full abstract»

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  • Transmission theory of spherical waves

    Publication Year: 1938, Page(s):744 - 750
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    This paper formulates the essential properties of spherical waves in terms of familiar engineering concepts. The physical picture resulting from this point of view facilitates the solution of certain physical problems, notably those having to do with reflection, refraction, shielding and power absorption. View full abstract»

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  • An analysis of the induction machine

    Publication Year: 1938, Page(s):751 - 757
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    THERE has long been a need for a means of evaluating the performance of induction motors under transient conditions, as when driving pulsating compressor loads. The familiar equivalent-circuit analysis is inadequate to determine the effects of pulsating speeds, and the more complete analysis of S. J. Levine1 is somewhat inconvenient, since the rotating axes assumed lead to involved equa... View full abstract»

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  • High-voltage gaseous and fluorescent tubes for advertising and architectural lighting effects

    Publication Year: 1938, Page(s):758 - 762
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7660 KB)

    Rapid strides have been made in the field of high-voltage electrical-discharge tubes. The most recent development has been the use of fluorescent phenomena. Fluorescent materials were first introduced as an integral part of the glass. The New York World's Fair has made a number of installations of Claude Zeon fluorescent tubes in which the fluorescent materials are placed as a coating on the insid... View full abstract»

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  • Reactance of square tubular bus bars

    Publication Year: 1938, Page(s):762 - 766
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    SQUARE tubular bus bars are coming into use to an increasing extent, as they are economical and convenient for joining to insulators and to branch circuits. The reactance of bus-bar circuits is frequently of importance, in order to compute the voltage drop under normal conditions and the current under short-circuit conditions. The purpose of this paper is to present formulas and curves by which th... View full abstract»

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  • Absolute power factor of air capacitors

    Publication Year: 1938, Page(s):766 - 773
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    AS THE sensitivity of measuring equipment has been improved, it has become evident that all air capacitors are not loss free. The high sensitivity bridges used today in dielectric investigations measure the difference between the power factor of the standard air capacitor and of the specimen in the test capacitor. To determine accurately the loss in the specimen the value of the absolute power fac... View full abstract»

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  • Basic equations for electric and sound radiations

    Publication Year: 1938, Page(s):774 - 776
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    THE purpose of this discussion is to derive the basic equations for electric radiation and for sound radiation by elementary calculus, without using the notions of differential equations or of vector analysis. The essential step is the selection of an elementary wave pulse discontinuous only at its front and not involving double layers nor regions of infinite energy at the wave front. View full abstract»

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  • Amplitudes of magnetomotive force harmonics for fractional slot windings — I

    Publication Year: 1938, Page(s):777 - 785
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    Fractional slot windings have certain well-known attributes which cause them to be quite generally used in synchronous-machine design. However, it is recognized that occasionally a winding will be produced which will develop harmonics in the air gap magnetomotive force that will lead to excessive losses, vibration, and noise. The published methods for computing the amplitudes of these harmonics ar... View full abstract»

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  • The economic status of the engineer

    Publication Year: 1938, Page(s):786 - 790
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    This is not a committee report, though perhaps it could be made to serve as such, because its genesis was a request from the committee on the economic status of the engineer that a paper be written around the author's remark, “The economic status of the engineer is largely a matter determined by each individual engineer according to his particular personal qualifications and the relations t... View full abstract»

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  • Selection and design of the electrification of the San Francisco-Oakland Bay Bridge railway

    Publication Year: 1938, Page(s):791 - 796
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    THE San Francisco-Oakland Bay Bridge was built by the State of California not only for heavy automobile traffic but also to benefit the 30,000,000 suburban railway passengers per year who are now transported across San Francisco Bay by passenger ferry boats belonging to the railway companies. The railway passengers, who are practically all commuters living in the east-bay cities and working in San... View full abstract»

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  • Annual reference index 1938

    Publication Year: 1938, Page(s):1 - 20
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Aims & Scope

This Periodical ceased publication in 1963. The current retitled publication is IEEE Spectrum.

Full Aims & Scope