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Electrical Engineering

Issue 9 • Date Sept. 1953

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Displaying Results 1 - 25 of 50
  • [Front cover]

    Page(s): c1
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    Freely Available from IEEE
  • [Advertisement - Front inside cover]

    Page(s): c2
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  • Contents

    Page(s): 1
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  • [Advertisements]

    Page(s): 2A
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  • Highlights

    Page(s): 3A
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  • [Advertisements]

    Page(s): 4A - 12A
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  • Training graduate engineers for a professional career

    Page(s): 761 - 763
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    If we are to keep up with the steadily increasing demand for technical personnel, we will be forced to develop greater productivity per person in the future. Not only can we provide better training for those engineers who go into management and sales, but we can use the engineer's talents to best advantage by utilizing the services of technicians and liberal arts graduates where possible. View full abstract»

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  • Industrial application of infrared

    Page(s): 764 - 769
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    The current thinking concerning the peculiar advantages of this method as compared to other methods of heating, and the variations of equipment in use within the infrared process itself are presented. View full abstract»

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  • Arc interruption phenomena in a magnetic field

    Page(s): 770
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    ARC IMMOBILITY and arc reversal phenomena limit the use, affect the design, and dictate the test procedure required for aircraft circuit interrupting equipment using magnetic arc suppression. Laws of physics which earth-bound electrical designers use unquestioningly are found to require re-examination when applied to magnetic arc interruption equipment for use at altitude. It had been assumed for more than half a century that an electric arc, like any other conductor free to move in a magnetic field, would move in a direction determined by Ampere's Law. This assumption is valid, for all practical purposes, for circuit breaking equipment operating at sea level. However, as the altitude is increased, an electric arc in a magnetic field may falter, stop, and finally reverse its direction of motion. View full abstract»

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  • Engineering safety into electric equipment

    Page(s): 771 - 776
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    Fire hazards in textile factories are scrutinized and suggestions are presented to improve the electric equipment and therefore achieve safer and more trouble-free installations. View full abstract»

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  • Square-loop core magnetic amplifiers

    Page(s): 777
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    THIS ANALYSIS APPLIES to magnetic-amplifier circuits of the center-tap, bridge-type, or a-c variety. Such circuits are called amplistats, Magamps, transductors, self-saturated magnetic amplifiers, and so forth. Figure 1 shows the circuit diagram of the center-tap connection. The amplifiers under discussion are of the so-called low control-circuit impedance type. In order to reduce the complexity of the analysis, many simplifying assumptions are made. While these assumptions introduce inaccuracies in the equations, the latter still serve effectively in establishing first-order relations among the variables. A large part of the analysis is applicable to core materials whose dynamic B-H loop is not strictly rectangular, such as grain-oriented silicon steel. View full abstract»

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  • Branch-circuit overcurrent protection for appliance loads

    Page(s): 778 - 779
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    Three typical branch circuits and their protective devices are examined. These are the general-purpose lighting and appliance branch circuits, the special branch circuits supplying a single fixed appliance, and motor branch circuits. View full abstract»

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  • Co-ordinating M1 and N1 telephone carrier systems

    Page(s): 780
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    THE BELL SYSTEM's new N1 carrier system is a low-level cable carrier system providing 12 4-wire telephone channels in the frequency range of 44 to 260 kc. Because of its low levels, the N1 system is particularly susceptible to interference from other existing carrier systems with over lapping frequencies and higher energy levels. View full abstract»

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  • Natural frequencies of coils and windings

    Page(s): 781
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    KNOWLEDGE OF THE NATURAL frequencies of air-core and iron-core coils and of transformer and generator windings is of essential theoretical and practical importance. The transient response of coils and windings subjected to impulse waves has been determined in the literature by two different methods, the “standing wave” and the “traveling wave” approach. The values of the natural frequencies enter into the analytical expressions of both these methods of calculation. View full abstract»

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  • Automatic control system with provision for scanning and memory

    Page(s): 782 - 784
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    The development work on which this article is based was sponsored by the Bureau of Ships, United States Navy Department. This system adjusts a control element to produce a maximum or minimum value of a resulting parameter. The control element is scanned through its entire range of adjustment and returned to the position resulting in the desired maximum or minimum effect. In a system where maxima or minima are present, the tuning equipment reliably selects the largest. The apparatus required is simple and easily understood, and can be maintained by relatively unskilled personnel. View full abstract»

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  • D-C dynamic braking of induction motors

    Page(s): 785
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    A THOROUGHGOING RATIONAL method of calculating the braking torque to be expected from squirrel-cage motors when direct current is applied to the stator has been an elusive development. The question is not one of widespread importance but, in some control applications, a sure knowledge of the speed-torque relationship might be critically important. View full abstract»

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  • A subscriber toll dialing tape reader

    Page(s): 786
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    IN ONE SYSTEM of customer toll dialing,1 the call record is a punched tape as shown in Figure 1. A simple recorder containing punch and step magnets driven directly by dial impulses produces the tape record. Transcribing information from the tape by eye would be slow and cumbersome; hence an automatic “reader” is needed to translate the information to a more convenient form. View full abstract»

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  • A level compensator for telephotograph systems

    Page(s): 787 - 791
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    To eliminate interference in telephotograph transmission through broad-band carrier equipment, it was decided to cancel it from the signal delivered by the carrier facility instead of modifying the carrier equipment. Consequently, a recently developed telephotograph level compensator, consisting of a pilot channel arrangement designed for insertion in the telephotograph connecting circuits, is utilized. View full abstract»

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  • Magnetic amplifier circuits and applications

    Page(s): 791 - 795
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    The most commonly used magnetic amplifier circuits and their applications are reviewed in their general form. The information is presented in the order of invention or use and thus follows quite closely the chronological sequence. View full abstract»

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  • Transfer function measuring and recording system

    Page(s): 796
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    THE SYSTEM DESCRIBED gives a polar plot of the transfer functions of industrial processes, process controllers, and instrument servomechanisms. Included in the system is an accurate mechanical signal generator which produces pneumatic, electric, and motion sine waves having a frequency range of 1/30 to 720 cycles per minute. A data sampling technique is employed which by-passes the need for having recorders with a dynamic response considerably better than the system under test. Furthermore, the Nyquist plot is recorded directly on a single sheet of paper thus simplifying the data reduction, handling, and storage problem. As the transfer function may be studied while the test is in progress, the operator is assured that he will not miss any significant points of the plot. View full abstract»

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  • The permeability of silicon-iron

    Page(s): 797
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    THE MOST SIGNIFICANT characteristic for core materials to be used in communication transformers is the initial permeability, which should be as high as possible and exhibit a minimum change versus the exciting field strength. These requirements are dictated by the necessity to keep signal attenuation and distortion in these transformers to a minimum, and by the characteristic behavior of magnetic materials at extremely low flux or field strength levels. View full abstract»

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  • Techniques in handling load regulating problems

    Page(s): 798
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    RECENT UNPRECEDENTED load growth has stimulated parallel operation to such an extent that there are now only six major interconnections in the United States. The operation of these vast grids has brought two major problems into sharp focus: 1. Permissible scheduled loading on critical arterial tie lines is being reduced by the use of increasingly large cyclic swings. 2. Appreciable savings are being lost by the inability of operating personnel to maintain the loading on an increasing number of stations and units in accordance with incremental costs. View full abstract»

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  • The nature of nuclear power

    Page(s): 799 - 803
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    The various types of nuclear reactors which can be used with the advantages and disadvantages of each, the abundance of nuclear versus fossil fuels, and the cost of nuclear power are discussed. View full abstract»

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  • Unique outdoor hydroelectric plant

    Page(s): 803 - 807
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    This plant is the first hydroelectric installation in the upper midwest area subject to a temperature range of +105 to −30 degrees Fahrenheit. Built into the masonry substructure of a retired 10-unit plant, economics, climate, and the site dictated the incorporation of design features and innovations to assure all-weather operation. View full abstract»

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  • Cathode-ray synchroscope and automatic synchronizer

    Page(s): 808
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    TODAY ELECTRONICS IS forging a silent evolution in all fields of industry; and the modern tendency in power generating stations is to have the control gear operating electronically whenever possible. 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