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Electrical Engineering

Issue 12  Part Supplement • Date Dec. 1940

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Displaying Results 1 - 25 of 155
  • [Front cover]

    Publication Year: 1940, Page(s): c1
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  • Contents

    Publication Year: 1940, Page(s): 1
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  • Contents

    Publication Year: 1940, Page(s): 1
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  • A new measuring instrument for direct current

    Publication Year: 1940, Page(s):683 - 686
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1988 KB)

    This paper describes the design of a new d-c measuring instrument of the permanent-magnet moving-coil type. Alnico is utilized as a magnet alloy and the design factors involved in the application of this material to instrument design are discussed. A moving system for use with the Alnico magnet system is described and the resulting instrument performance summarized. View full abstract»

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  • The rectifier calculus

    Publication Year: 1940, Page(s):687 - 691
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1171 KB)

    INITIAL efforts in rectifier engineering have quite naturally been directed toward mechanical design. But as the proportion of industrial power load carried by rectifiers is becoming large, due to electrolytic plants (electrochemical industries) and other new applications, it is important to be able to solve the more difficult circuit problems without excessive labor. View full abstract»

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  • Recent developments in speed regulation

    Publication Year: 1940, Page(s):692 - 700
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  • Characteristics of restricted ionization and its relation to voids in insulating materials

    Publication Year: 1940, Page(s):701 - 708
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2182 KB)

    THE phenomena accompanying the formation of corona about cylindrical conductors and the laws governing such corona formation have been under investigation for a number of years, and the relations of such corona loss to voltage gradient, pressure, temperature, and the geometry of the system are now quite completely rationalized. Corona or ionization also occurs in restricted spaces, such as the voi... View full abstract»

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  • Corona discharge on rubber-insulated cables

    Publication Year: 1940, Page(s):709 - 714
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    When rubber-insulated cables operate at higher than 1,500 volts potential, conditions may be favorable to the production of corona discharge over all or a portion of the outer surface of the insulation, or its braid covering. The cable may be on an inner metal conduit surface, or lie on a grounded flat metal surface, all of these conditions being favorable to surface corona at sufficiently high vo... View full abstract»

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  • The dielectric strength and life of impregnated-paper insulation — I: The influence of the density of the paper

    Publication Year: 1940, Page(s):715 - 720
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    PAPER as used in the spiral laminated impregnated insulation of high-voltage power cables is available over wide ranges of density and thickness. There result important variations in the ordinary physical properties of the paper such as flexibility, tearing, tensile, and bending strength. Variations in the electrical properties of conductivity, dielectric constant, and breakdown strength also resu... View full abstract»

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  • Tests on oil-impregnated paper — IV: Mechanism of breakdown

    Publication Year: 1940, Page(s):721 - 729
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5937 KB)

    IN three previous papers1,2,3 we have presented some of the results of our studies on miniature cable specimens started in 1934. In the first two papers the relative life histories and the results of post-mortem examinations were given for (a) specimens saturated with gas at one atmosphere pressure, (b) specimens saturated with gas at 200 pounds per square inch pressure, and (c) specime... View full abstract»

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  • Dielectric strength of insulating liquids in a continuously circulating system

    Publication Year: 1940, Page(s):730 - 737
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2120 KB)

    THE electrical properties of liquid dielectrics have been studied by theoretical and experimental physicists for a long time. Of the various properties one of the most important, and probably the least understood, is the mechanism of electrical breakdown. To become acquainted with the voluminous literature in this field one must read not only monographs1–4 but also more recent im... View full abstract»

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  • Painting the golden gate international exposition with light

    Publication Year: 1940, Page(s):738 - 746
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    ON a man-made island of 400 acres which President Roosevelt has referred to as our latest insular possession, architects, artists, and engineers have constructed a magic walled city about an architectural plan that combines the ancient designs of Burmese, Cambodian, Incan, Mayan, and other Pacific cultures into the unique and surprisingly beautiful Golden Gate International Exposition. One and a h... View full abstract»

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  • Ionization time of thyratrons

    Publication Year: 1940, Page(s):747 - 750
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1913 KB)

    GRID-CONTROLLED vapor-filled rectifiers, or thyratrons, have not been considered in the past for use in blocking and sweep circuits for cold-cathode-type oscillographs because of their inherent ionization time. A search of the literature on the subject, and reference to manufacturers' data sheets furnished little useful information on this ionization time. A research program to determine the minim... View full abstract»

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  • 12-Kv metal-enclosed bus and switch structure, station C, Oakland, Pacific gas and electric company

    Publication Year: 1940, Page(s):751 - 755
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    THE East Bay metropolitan area, comprising the cities of Oakland, Berkeley, Alameda, Piedmont, and Richmond, is located on the east shore of San Francisco Bay. The population of these communities exceeds 500,000. View full abstract»

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  • Electrical equipment of the Union Pacific steam-electric locomotive

    Publication Year: 1940, Page(s):756 - 764
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    THE development of the steam-electric locomotive for the Union Pacific Railroad represents the culmination of more than two years of co-operative design and research by scientists, engineers, and officials of the railroad and of the various manufacturers of equipment for this outstanding example of modern motive power. It is the intention of the authors to deal primarily with the electrical detail... View full abstract»

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  • Some practical measuring devices

    Publication Year: 1940, Page(s):765 - 768
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    IN the operation of a large utility very often it is desirable to make practical measurements which are not generally obtainable from the usual manufactured devices. It therefore becomes necessary to make some unusual devices to record information that will assist in the operation of a large system. This discussion will present some devices that have proved very useful for years, and some more rec... View full abstract»

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  • Temperature survey of the United States

    Publication Year: 1940, Page(s):769 - 774
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    IN establishing the rating of electrical apparatus there are many factors involved. The maximum temperature reached by any part of the insulation is one of these. However, the relationship of temperature to rating is a complex function and the rating cannot be considered as a function of temperature alone. View full abstract»

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  • Mingled hydro and steam power production in California — Past, present, and future

    Publication Year: 1940, Page(s):775 - 781
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    THE development in the United States of the central-station industry from its inception in San Francisco in 1879 and in New York in 1882, to the present, has been made in two broad phases. The initial or pioneer phase includes the first isolated steam-electric plants serving lighting customers, followed by small hydroelectric plants serving nearby customers and later (in Oregon in 1889) with the d... View full abstract»

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  • Fractional-slot and dead-coil windings

    Publication Year: 1940, Page(s):782 - 794
    Cited by:  Papers (1)
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    THE expression “fractional-slot windings” is commonly applied to machines where the number of slots is not an integer multiple of the product of the number of poles and phases. Dead-coil windings (D.W.) refer to windings where some of the slots contain wedges instead of coil sides. We shall use the term (F.W.) in this paper to comprise all windings which are not (D.W.). The term (F.W... View full abstract»

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  • Analysis of factors which influence the application, operation, and design of shunt-capacitor equipments switched in large banks

    Publication Year: 1940, Page(s):795 - 800
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1382 KB)

    THE application of shunt capacitors to distribution circuits has been well treated in the technical press. These papers have in general dealt with conditions obtaining when relatively small banks of capacitors are connected to the circuit 24 hours of the day. The increase in knowledge of the benefits afforded by capacitors through experience and analysis, coupled with the price reductions effected... View full abstract»

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  • Dynamic characteristics of a single-phase induction motor

    Publication Year: 1940, Page(s):801 - 806
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    SMALL-SIZE single-phase induction motors are used today principally on intermittent duty. In many cases this intermittent starting and stopping is automatically controlled. Loads are thus suddenly applied and as suddenly removed. View full abstract»

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  • Electronic measurement of surge-crest voltages

    Publication Year: 1940, Page(s):807 - 811
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    QUICK determinations of crest surge potential values by a simple direct method are often desirable in the laboratory to supplement the cathode-ray oscillograph which records the entire surge phenomenon. The generally used sphere-gap method of potential measurement has, however, the disadvantages that a number of tests must be made in the process of adjusting for the breakdown distance, and sometim... View full abstract»

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  • Measurement of very short time lags

    Publication Year: 1940, Page(s):812 - 815
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2780 KB)

    THE time lag of electrical breakdown of various air gaps and solid insulations is of particular importance in co-ordination1 of insulation for transient lightning surges. Generally, time lag of breakdown is in part a function of chance ionization conditions in the breakdown path and therefore the measurements become often of a statistical nature.2 Thus, where a large number o... View full abstract»

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  • Importance of gas in electrodes for the glow-to-arc transition

    Publication Year: 1940, Page(s):816 - 821
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2431 KB)

    IN an earlier work1 on the probability of glow-to-arc transitions in a low-pressure mercury-vapor discharge it was pointed out that these transitions occur in a completely random fashion and that the probability of a transition increases with an increase of pressure, cathode-current density, or glow voltage. In particular, cathode temperature was found to be very important, the transiti... View full abstract»

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  • Lightning investigation on a 220-kv system — III

    Publication Year: 1940, Page(s):822 - 827
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1395 KB)

    LIGHTNING research has been conducted for the past 13 years1–6 by the Pennsylvania Power and Light Company, the General Electric Company, and the Ebasco Services, Inc., chiefly upon that portion of the Pennsylvania-New Jersey 220-kv interconnection circuit between Wallenpaupack and Siegfried, Pa. This 65-mile-long circuit is of aluminum-conductor steel-reinforced three-conductor ... View full abstract»

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Aims & Scope

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

Full Aims & Scope