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American Institute of Electrical Engineers, Transactions of the

Issue 8 • Date Aug. 1935

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Displaying Results 1 - 24 of 24
  • List of Contributors

    Page(s): 805
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  • Table of contents

    Page(s): 805 - 806
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  • In the Issue

    Page(s): 806
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  • A Message From the President

    Page(s): 807
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  • The Newly Discovered Elementary Particles

    Page(s): 808 - 816
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    During the 3 years following the discovery of heavy hydrogen in the latter part of 1931, 4 additional elementary particles of matter lighter than the alpha particle (nucleus of the ordinary helium atom) have been discovered where only 2 were known previously. This is considered extraordinary even for the present rapid pace of physics which sometimes requires physicists to revise their fundamental concepts of matter almost overnight. These 5 newly discovered particles formed the subject matter of a highly interesting and instructive address delivered recently by Doctor Darrow at a meeting of the Institute's New York Section; the essential substance of this illuminating address is presented herewith. View full abstract»

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  • Practical Applications of Insulation Research

    Page(s): 816 - 821
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    By applying the results of insulation research to factory equipment and procedures, manufacturers of oil-impregnated paper-insulated cables for electric power transmission and distribution have been able to effect marked improvements in their products. By following and taking advantage of these improvements as they develop, users of cable have been able not only to obtain more satisfactory operating results, but also to effect substantial savings. Some of the more recent achievements in insulation research and their practical applications are outlined briefly in this paper. View full abstract»

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  • The Hawaiian Radiotelephone System

    Page(s): 822 - 828
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    The radiotelephone communication system that links the 5 major islands of Hawaii and some of the engineering problems involved in developing it form the subject matter of this paper. This system, which has been in successful operation for more than 3 years, operates on frequencies between 30 and 60 megacycles per second, although in April 1935, an experimental circuit operating on 220/230 megacycles was placed in service. The successful operation of this system has shown that ultra-high frequencies are well suited to short quasi-optical ranges and that reliable semi-nonattended radiotelephone services are practicable. View full abstract»

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  • Ship-to-Shore Radio in Puget Sound Area

    Page(s): 828 - 831
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    Telephone communication to and from harbor craft in the Puget Sound area in the State of Washington is accomplished by means of low powered radiotelephone channels from each boat to a single land station from which connections can be made to any telephone; the equipment used for this purpose is described here. A 400 watt transmitter is used in the land station and a 50 watt transmitter on each boat. Frequencies used are 2,522 kilocycles for the shore-to-ship direction, and 2,126 kilocycles for the ship-to-shore direction. View full abstract»

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  • Regulation Beyond the Distribution Substation

    Page(s): 832 - 837
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    Nonuniform load growth, which sometimes results in excessive voltage drops in various parts of an electric power distribution system, caused engineers to consider extending the installation of voltage regulating devices to portions of the system beyond the station. As a result, several supplementary devices have been developed for use in distribution circuits between station and load. These devices and their applications are discussed in this paper. View full abstract»

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  • Lightning Currents in Field and Laboratory

    Page(s): 837 - 843
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    A review of available data on the magnitude and effects of lightning stroke currents, supplemented by laboratory experiments to check these effects, is presented here-with. Maximum currents of 150,000 to 200,000 amperes having durations of from 40 to 100 microseconds are indicated. View full abstract»

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  • Recent Research in Radio Communication

    Page(s): 843 - 846
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    A review of the literature describing research investigations in the field of radio communication, published in the United States and other countries during the past year and more, indicates the progress being made in this field. For each of the 5 principal classifications into which radio communication research is found to be divided, a summary of recent progress is included as part of this article, and a bibliography totaling 104 items gives reference to the principal articles in these 5 divisions. View full abstract»

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  • Corona Losses at 230 Kv With One Conductor Grounded

    Page(s): 846 - 847
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    Tests have been made to determine the increase in corona losses on a high voltage transmission line, due to the grounding of one of the conductors. The corona losses under this condition of operation, which may occur on a transmission system not having the neutral solidly grounded, are shown to be considerably increased over the more usual operation with all 3 conductors at the same voltage. This corona loss may increase the in-phase component of current, with a consequent effect on the operation of Petersen coils. The conductors of the line used in these tests were hollow copper conductors composed of interlocking segments. View full abstract»

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  • A New Carrier-Current Coupling Capacitor

    Page(s): 848 - 852
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    By means of coupling capacitors connected to high voltage power transmission lines, high frequency carrier currents in different frequency channels may be transmitted over the power lines for supplementary services such as relaying, control, and communication. A new design of coupling capacitor has been made which, by combining 1, 2, 3, or 4 units in series, may be used on 69, 138, 230, or 287 kv circuits. Capacitors of the latter rating are being used on the Boulder Dam line of the city of Los Angeles. View full abstract»

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  • Resonant Lines for Frequency Control

    Page(s): 852 - 857
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    Vacuum tube oscillators for radio frequency signals above 25 megacycles may be controlled with a high degree of precision by resonant lines, and at lower frequencies may be used to obtain a larger power output than is obtainable from crystal oscillators. The general principles of the design of concentric conductor lines and means for compensating temperature changes are discussed in this paper. Line controlled oscillators may be used with frequency Multipliers, or to control oscillators at lower frequencies. View full abstract»

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  • A Radio Interference Measuring Instrument

    Page(s): 857 - 862
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    Consideration of the factors involved in radio interference field strength measurements indicates that the effective values measured by conventional methods are inadequate for describing the interfering effect of the disturbing radiation. The instrument described in this paper provides a means for measuring with acceptable accuracy both crest and effective values of interference field strength the ratio of which interference field strength, the ratio of which agrees with observed discrepancies between effective and apparent values. View full abstract»

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  • Diesel Electric Motive Power for Railroads

    Page(s): 863 - 868
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    Recent developments in internal combustion engines have provided a source of mobile motive power for railroads which has shown economies over steam operation in some classes of service. The continuing development of Diesel engines gives promise of their further substitution for steam power, but in the application of this unit, performance characteristics must be considered carefully. The recently developed ``streamlined'' Diesel electric trains are rather limited in application, but the Diesel engine has an immediate field of application in switching and transfer locomotives. Electrical transmission of power from the Diesel engine to the driving wheels of a train has advantages which make it preferable to any other type of transmission as yet developed. View full abstract»

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  • Spark Lag of the Sphere Gap

    Page(s): 868 - 876
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    Measurements of time lag of spark-over of small sphere gaps at 3,820 volts were made with an instrument developed specifically for the purpose. Spark lags were found to fall into 3 distinct domains: 1 of relatively long initiatory lags of random distribution, and 2 of definite formative lags of different orders of magnitude corresponding to 2 different spark-over mechanisms. The controlling conditions which determine into which domain the spark lag will fall are given. The manner in which this lag may obscure the sparking voltage of the gap is pointed out and a remedial specification suggested. The results are applicable to larger sphere gaps and higher voltages. View full abstract»

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  • Registration or Engineers

    Page(s): 876 - 881
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    Following is the full text of an address presented at the A.I.E.E. summer convention, Ithaca, N. Y., June 24-28, 1935, and prepared at the request of the A.I.E.E. committee on education, in order that the membership might be more fully informed concerning engineers' registration and the related problems of the profession, and may determine to what extent the arguments for registration apply to electrical engineers, whether engaged in practice for themselves or employed by others, and whether engaged on private or public work. View full abstract»

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  • News of Institute and related activities

    Page(s): 891 - 909
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  • Future AIEE Meetings

    Page(s): 892
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  • Letters to the Editor

    Page(s): 909 - 916
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  • Membership

    Page(s): 916
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  • Engineering Literature

    Page(s): 916
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