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Electrical Engineering

Issue 10 • Oct. 1949

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Displaying Results 1 - 25 of 52
  • [Front cover]

    Publication Year: 1949, Page(s): c1
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  • [Advertisement - Front inside cover]

    Publication Year: 1949, Page(s): c2
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  • Contents

    Publication Year: 1949, Page(s): 1
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  • [Advertisement]

    Publication Year: 1949, Page(s): 2A
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  • Highlights

    Publication Year: 1949, Page(s): 3A
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  • [Advertisement]

    Publication Year: 1949, Page(s):4A - 12A
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  • To be or not to be?

    Publication Year: 1949, Page(s): 829
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB)

    Whether AIEE should confine its interests and activities to those of a strictly technical and educational nature is a problem receiving considerable thought by Institute members. President Fairman here outlines the problem. View full abstract»

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  • The social and economic responsibilities of the engineer

    Publication Year: 1949, Page(s):830 - 833
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    There is a tendency for the specialist such as the engineer to become so absorbed in his responsibilities toward his work that he is apt to neglect his higher responsibility, as a citizen, toward society as a whole. In this article the author warns us of the crisis that is facing civilization today, and charges the “men of trained mind” with the duty of arousing the unaware. View full abstract»

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  • Arcs between moving electrodes

    Publication Year: 1949, Page(s): 834
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    A NEW technique has been developed for studying characteristics of high-current arcs. The method consists of moving one electrode in the form of a steel tape at a high speed relative to the other electrode in the form of a rod. A d-c arc is drawn between the two electrodes. View full abstract»

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  • Heating of cables in a Duct bank

    Publication Year: 1949, Page(s): 835
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB)

    IN THE calculation of the temperatures attained by underground cable systems installed in duct banks, it has been customary to base such calculations upon a set of experimentally determined thermal resistances commonly known as the “National Electric Light Association Duct Heating Constants,” by which the temperature rise above the ambient earth temperature of cables located in the d... View full abstract»

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  • Techniques for improved magnetic recording

    Publication Year: 1949, Page(s):836 - 841
    Cited by:  Papers (2)
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    This article describes some of the techniques which may be used to improve the frequency response, reduce the distortion, and increase the signal-to-noise ratio of magnetic recording systems. Also discussed are some new methods of measurements by which these improvements may be evaluated. The author believes the application of the techniques to practical systems will not necessarily follow immedia... View full abstract»

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  • A spring mechanism for circuit breakers

    Publication Year: 1949, Page(s): 842
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    FOR APPLICATIONS where neither storage batteries nor control power transformers are practical, some type of mechanism has been needed to close oilless circuit breakers at the necessary speed without requiring an external source of electric control power. In addition to the correct closing speed, such a mechanism should supply sufficient energy to close and latch the circuit-breaker contacts under ... View full abstract»

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  • Léon charles thévenin: (1857–1926)

    Publication Year: 1949, Page(s):843 - 844
    Cited by:  Papers (2)
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    Although Thévenin's theorem is used extensively, particularly by communication engineers, little is known of the man himself. This article, translated from the journal of the Administration of Posts, Telegraphs, and Telephones with which Thévenin was associated, outlines some of the highlights of his career. View full abstract»

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  • Raising fault capacity with air-core reactors

    Publication Year: 1949, Page(s): 845
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    IN AN expanding industrial plant, it frequently becomes necessary to increase the transformer capacity at a substation to care for heavier power demands at some particular location. An increase in the power capacity of the substation in turn increases the potential short-circuit kilovolt-amperage that might be applied to the substation bus. An increase in the capacity of the primary system furnish... View full abstract»

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  • A new 69-kv compressed air circuit breaker

    Publication Year: 1949, Page(s): 846
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    A NEW compressed air circuit breaker has been developed recently for a pioneering installation of outdoor metal-enclosed switchgear for 69-kv service. This circuit breaker, with a current rating of 2,000 amperes and with an interrupting capacity of 3.5 million kva, is of the indoor type mounted in a weatherproof steel enclosure for outdoor service. It has an orifice type of interrupter. View full abstract»

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  • Garrison dam power

    Publication Year: 1949, Page(s):847 - 852
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    One of several large federal power projects on the Missouri River, the Garrison Dam when completed will produce an average annual gross energy of 1,600,000,000 kilowatt-hours. A number of interesting and unusual features to be incorporated in the project are discussed. View full abstract»

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  • Guide for applying low-voltage air circuit breakers

    Publication Year: 1949, Page(s):852 - 854
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    Supplementing the ratings given in AIEE Standards, this guide outlines methods for determining short-circuit currents on d-c and a-c circuits. It also gives requirements for cascade and selective-trip arrangements of circuit breakers. View full abstract»

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  • Gas turbines in stationary power generation

    Publication Year: 1949, Page(s): 855
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    THE ULTIMATE possibilities of gas turbines have been publicized widely. Many of the developments on which improved performance at an economic cost are dependent, are now in such a preliminary stage of research that it is impossible to predict the extent to which these ultimately will be incorporated in commercial gas turbines. This very uncertainty makes the future of the gas turbine intriguing to... View full abstract»

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  • Induction motors for synchronized drives

    Publication Year: 1949, Page(s): 856
    Cited by:  Papers (1)
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    THERE are two types of synchronized drives of two or more mechanically independent shafts commonly known: one is the “power selsyn” or “synchro-tie;” and the other might be called the “simplified selsyn.” The first system uses, besides one or more prime movers, individual selsyn motors for synchronizing. The analysis and application of this type is very we... View full abstract»

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  • Trends in fluorescent lamps

    Publication Year: 1949, Page(s):857 - 860
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1944 KB)

    A slender green tube 18 inches in length, introduced to illuminating engineers in 1935, is the progenitor of today's vast fluorescent lamp industry. Since that time, the basic methods of operating the tube have changed little. Engineers have improved and elaborated on fundamental system elements, such as ballasts, starters, and cathodes; as a result of their work, a large variety of lamps is avail... View full abstract»

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  • The thermal movement of moisture in soil

    Publication Year: 1949, Page(s): 861
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    IT HAS long been known that when a moist soil is subjected to a temperature gradient, the moisture will have a tendency to move in the direction of heat flow. This phenomenon is of considerable interest in cable heating studies because the thermal conductivity of the earth in the heat field involved will decrease as moisture is lost. It is of like interest in the heat pump using a buried ground co... View full abstract»

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  • Frequency-response control charts

    Publication Year: 1949, Page(s): 862
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    CONTROL chart methods1 developed extensively in connection with mechanical tolerances are useful in controlling the frequency-response characteristics of electro-acoustic receivers. The entire frequency response of a receiver can be kept within statistical control by controlling the critical regions alone. Two of these critical regions are described. View full abstract»

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  • Thoriated tungsten filaments in rectifiers

    Publication Year: 1949, Page(s): 863
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (798 KB)

    THORIATED tungsten filaments have been in widespread use for low-voltage tubes for many years. By the addition of the carbonization process, they are used successfully at several thousand volts. The generally accepted view as expressed in textbooks and papers as recently as 1941 has been that 5,000 volts was the maximum voltage for a thoriated tungsten filament. Today, it is well known that during... View full abstract»

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  • Recloser-fuse co-ordination

    Publication Year: 1949, Page(s): 864
    Cited by:  Papers (1)
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    DEPENDABLE electrical service in suburban and rural areas is of increasing importance because of the addition of many new electric appliances to the home and the continued expansion n of farm electrification. Power outages seriously inconvenience the residential consumer and may cause heavy loss of produce on the farm. Moreover, rising labor and automotive costs have increased utility operating ex... View full abstract»

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  • Semiconductor rectifiers

    Publication Year: 1949, Page(s):865 - 872
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    A summary of the material on rectification presented at a symposium held during the recent AIEE Summer General Meeting, this article discusses qualitatively the theories of rectification and noise generation in metal-semiconductor contacts. 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