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Electrical Engineering

Issue 7  Part Section One • Date July 1931

 This issue contains several parts.Go to:  Part Section Two 

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  • [Front cover]

    Publication Year: 1931, Page(s): c1
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  • [Front inside cover]

    Publication Year: 1931, Page(s): c2
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  • Contents

    Publication Year: 1931, Page(s):1 - 2
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  • Relay protection for a “close-linked” system

    Publication Year: 1931, Page(s):471 - 475
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (639 KB)

    Relay-protection design involves a detailed study not only of the required standards of service but also of the general design and layout of the power system to be protected. The “close-linked” type of system of Chicago and the special relaying system which it demanded, are discussed. View full abstract»

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  • Magnetic “iron” perfected by research

    Publication Year: 1931, Page(s):475 - 476
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Thirty years ago great quantities of iron were necessary in cores of electrical devices to prevent undue electrical loss. High temperatures caused magnetic deterioration of the metal. Even alloys of apparently constant chemical composition had varying magnetic properties. In view of this obstacle, progress in transformers of electrical currents was especially difficult. View full abstract»

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  • Overseas radio telephone service

    Publication Year: 1931, Page(s):476 - 477
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  • Theoretical studies laboratory and field tests operating experiences lead to effective system protection against lightning disturbances

    Publication Year: 1931, Page(s):478 - 481
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB)

    That the concerted efforts of power companies and electrical manufacturers to combat the disturbing influences of lightning already have borne fruit, is attested by the greatly reduced transmission line outages from this cause. Results of recent investigations in this field as described in twelve Institute papers form the basis for the six articles which follow. View full abstract»

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  • Theories of lightning discharge and traveling waves

    Publication Year: 1931, Page(s):481 - 486
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    Recent theoretical findings concerning lightning and traveling waves are discussed in this article. When corroborated by field tests, these results furnish information from which a systematic scheme of protection can be established. “Direct-hit” wires above ordinary “sky wires” are suggested and discussed. View full abstract»

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  • Field tests with artificial lightning

    Publication Year: 1931, Page(s):487 - 490
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (570 KB)

    High-voltage impulses simulating lightning surges can be impressed on a line at will, and now provide the most convenient means for studying the characteristics of such waves. Corona is found to be the greatest cause of wave attenuation and distortion; to a lesser extent, skin effect. View full abstract»

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  • Field tests with natural lightning

    Publication Year: 1931, Page(s):490 - 497
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    Although lightning surges of as high as 5,000 kv. have been recorded, only about ten per cent of these have crest voltages of more than seven times normal line voltage. One important result of recent investigations is the proof that a direct stroke can occur to a tower or ground wire without causing a flashover. View full abstract»

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  • Protection against lightning surges

    Publication Year: 1931, Page(s):498 - 500
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    Requirements for a “lightning proof” line, where this seems justified economically, are outlined in this article. Insulation alone is not the final answer, only one of several important features of proper line design. A new arrester of the gap type is described also, wherein the breakdown medium is a column of air. View full abstract»

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  • Lightning versus system operation

    Publication Year: 1931, Page(s):501 - 502
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB)

    Operating experiences form the final proving ground of the many theories developed; the efficiency of any scheme of protection may be ascertained accordingly. Although one overhead ground wire already is known to be highly beneficial, two are shown to be unquestionably better. Opinions conflict as to the effect of tower footing resistance. View full abstract»

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  • Single patent appeal court is proposed

    Publication Year: 1931, Page(s):502 - 506
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (757 KB)

    On the basis of long practical experience the author condemns the present procedure in patent litigation and outlines the foundation for a proposed single United States Court of Patent Appeals which would be second only to the U. S. Supreme Court and would abolish the duplicate and conflicting efforts of the ten district courts in patent matters. Full text of a proposed House of Representatives bi... View full abstract»

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  • Twin motors for heavy rolling mills

    Publication Year: 1931, Page(s):506 - 510
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (714 KB)

    Twin-motor drive has met effectually the repeated demands for more power at the rolls. Other advantages, however, which now far overshadow the improvement originally sought are the direct outcome of the reduced inertia and greater operating flexibility inherent in this type of drive. View full abstract»

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  • A vacuum-tube device for current-balance telemeters

    Publication Year: 1931, Page(s):510 - 511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (302 KB)

    The motor-operated rheostat with its associated apparatus now is replaced by a simpler, more compact vacuum-tube arrangement. The only auxiliary power required can be obtained from an ordinary station-lighting circuit; circuit constants are chosen so that momentary dips in this supply voltage do not affect the readings. View full abstract»

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  • Clinical sunlight — Natural and artificial

    Publication Year: 1931, Page(s):511 - 512
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Discovery of reasons for the well-known beneficial effects of sunlight on health has been a stimulus to efforts to produce artificial sunshine for use when and where natural sunshine is not available. Knowledge of the amounts of energy in various wavelengths of the solar spectrum throughout the year is necessary for production of the best artificial sunlight. Therefore measurements of sunlight in ... View full abstract»

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  • Coordination — The essence of modern engineering

    Publication Year: 1931, Page(s):512 - 513
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    President A. I. E. E. Engineering enterprise has developed so rapidly from the application of individual technical skill to the combined technical efforts of many and variously qualified persons, that it seems propitious to consider briefly one of the most important of the present controlling features. A modern engineering undertaking of any appreciable size whatever involves influencing factors r... View full abstract»

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  • News of Institute and related activities

    Publication Year: 1931, Page(s):514 - 526
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  • Local meetings

    Publication Year: 1931, Page(s):526 - 530
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  • Employment notes of the engineering societies employment service

    Publication Year: 1931, Page(s):531 - 534
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  • Membership

    Publication Year: 1931, Page(s): 534
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  • Engineering literature

    Publication Year: 1931, Page(s):535 - 539
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  • Industrial notes

    Publication Year: 1931, Page(s): 540
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Aims & Scope

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

Full Aims & Scope