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Electrical Engineering

Issue 2 • Date Feb. 1942

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Displaying Results 1 - 25 of 32
  • [Front cover]

    Page(s): c1
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  • [Advertisement - Front inside cover]

    Page(s): c2
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  • [Advertisements]

    Page(s): 1 - 18
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  • Contents

    Page(s): 1
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  • Highlights

    Page(s): 66
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  • Electrical features of the 200-inch telescope

    Page(s): 67 - 78
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    BRIEFLY, the function of the Palomar Mountain 200-inch telescope is to collect light from celestial objects and concentrate it at the prime focus, or, by a series of additional reflections from auxiliary mirrors, bring the light to other focal points both on and off the telescope. The major advantages of the 200-inch telescope over other large telescopes are: (1) its considerably larger light-gathering capacity, permitting reduction in time of exposures and the photographing of more distant objects; (2) its design, permitting astronomical work directly on the telescope at the prime focus, thus avoiding the loss of light through additional reflections: (3) its flexibility by remotely operated auxiliary mirror combinations; and (4) its automatically corrected drive and setting controls. View full abstract»

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  • Hybrid electrical porcelain developed

    Page(s): 79
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    THROUGH research at the Westinghouse Electric and Manufacturing Company's porcelain plant in Derry, Pa., a new porcelain that combines all the advantages of both the wet and dry processes of manufacture recently has been produced on a commercial scale. Intricacy of shape is combined with high dielectric and mechanical strengths at reasonable cost. View full abstract»

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  • Protective lighting for american industry

    Page(s): 80 - 83
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    PROTECTIVE lighting is not a new practice grown out of the present war program. It has been in use for the past 25 years and is better known as yard lighting. It has been used by generating plants to prevent raids on the coal pile, in silk mills to prevent theft of valuable merchandise, in automobile factories to prevent theft of storage batteries, tires and other readily saleable parts. Yard lighting has been universally used by steel plants to prevent yard accidents and by many plants as a means of protection of property during strikes. In some industries, such as shipbuilding and structural steel plants and oil refineries, much of the production work is carried on out-of-doors, and yard lighting has been used to facilitate production, storage, and shipping. During war times, theft, fire, strike damage, and interruption of production become “sabotage,” and so yard lighting takes on a new name — protective lighting, referring to protection of property — material, facilities, and life and limb. The chief difference is that loss from sabotage is greater and industry can ill afford the loss in such times. View full abstract»

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  • Heaviside's direct operational calculus

    Page(s): 84 - 88
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    OPERATIONAL CALCULUS is a very powerful tool for solving the differential equations of engineering. This article discusses some of the basic principles of Heaviside's direct operational calculus and how they can be applied to the solution of engineering problems. No attempt will be made to prove the various expressions that are to be used or to cover completely all the points of interest. The necessary justifications can be derived from the material to be presented in subsequent articles of this series. View full abstract»

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  • Automatic control for washing machines

    Page(s): 89 - 92
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    IN 1940 the American people spent $113,580,000 to buy 1,552,666 household washing machines. That is big business! But the only way the washing-machine industry could become a big business, and the only way it can remain a big business, is by supplying machines that fulfill the users' actual needs and desires. In practice, this means that the industry must anticipate by several years what features washing-machine buyers will want. View full abstract»

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  • Metals for tomorrow

    Page(s): 92
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    Which metals will continue to be used in increasing quantities? Already we are witnessing the phenomenal growth of the light metals. Military planes dictate the expansion of domestic production capacity to 700,000 tons a year for aluminum and 200,000 tons a year for magnesium, representing 5-fold and 100-fold increases compared with the 1937 peak output of the respective metals. When the war is over, efforts will be made to utilize this capacity. View full abstract»

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  • Institute activities: North Eastern district meeting to include branch convention

    Page(s): 93 - 98
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  • Of current interest: Field offices facilitate war production

    Page(s): 99 - 110
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  • Transactions section: Preprint of corresponding pages from the current annual AIEE transactions volume: High-capacity circuit-breaker testing station

    Page(s): 49 - 53
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    TEN years' experience with a high-power laboratory, giving approximately 1,100,000 three-phase initial symmetrical kilovolt-amperes on short circuit at the machine bus,1 has defined its usefulness and limitations and has resulted in an addition to its installed equipment. By taking advantage of assymmetry this capacity has been sufficient to demonstrate ratings up to 1,500,000 kva, and the increased testing capacity is required to demonstrate interrupting ratings of 2,500,000 kva. View full abstract»

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  • Electrical drives or wide speed ranges

    Page(s): 54 - 56
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    THE electrical drive for a wide speed range is obtained by the addition of a rotating regulator called a Rototrol to a conventional variable voltage system. This combination will give a speed range of 120 to 1 or more, and can be used effectively in many industries to simplify the mechanical design of the machine which it drives. Its use eliminates elaborate gear-change mechanism, clutches, and so forth, and at the same time gives a more flexible control scheme with the complete speed range under the control of the operator without leaving the work or stopping the machine. View full abstract»

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  • Measurement of maximum demand

    Page(s): 57 - 62
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    “Maximum demand” has become an increasingly important item in rates for the sale of electric service since the appearance of Doctor John Hopkinson's notable paper, “Cost of Electricity Supply,” in the year 1892 — nearly 50 years ago. The writer estimates that the demand-measuring equipment which is now being used by the public utilities of the United States has a value of the order of $100,000,000. This is an index of its present importance. The object of the present paper is to describe in detail the thermal-storage method of measuring the maximum demand of a user of electric service. A comparison is made between this method, which at each instant of time indicates the logarithmic average load over some nominal time interval, and the commonly used “block-interval” method, which indicates the arithmetic average load over the same time interval. Also, the effect of using a modified design of thermal-demand meters is discussed. The writer has contributed a number of previous papers dealing with this same general subject, reference to which will be found at end of paper. View full abstract»

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  • A new voltage-regulating relay plus line-drop compensator

    Page(s): 63 - 66
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    THERE are numerous applications where it is desired to measure a voltage at one point of a line or feeder by the use of an instrument placed at some other point. The instrument measures the voltage at the point of the line to which it is connected, and also measures the line drop to the remote point. These two measurements are combined so that the resultant indication is the voltage at the remote point of the feeder. If the instrument has contacts on it so that it may actuate control circuits, it is known as a voltage-regulating relay plus line-drop compensator. Such a device finds application ta regulating equipment such as tap-changing transformers, capacitor-switching schemes for power-factor control, and the like. View full abstract»

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  • A static voltage regulator insensitive to load power factor

    Page(s): 67 - 70
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    THE voltage regulator described in this paper is intended for those applications where the operating efficiency is of secondary importance to other requirements. Excluding the consideration of efficiency, the output voltage of an ideal voltage regulator should be of sinusoidal wave form and should remain constant with any variation in input voltage and frequency and any variation in load volt-amperes and power factor. View full abstract»

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  • Multichannel carrier-current facilities for a power line

    Page(s): 71 - 76
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    A carrier-current system providing a relatively large number of channels is in service on a high-voltage power line. The facilities provide: 1. Transmission of signals both ways for the opening of the circuit breakers at the remote end by the operation of relays at the near end. 2. Two-way telephone service between any extension telephone at the remote generating station and any telephone connecting to the main telephone switchboard in the central office building. 3. Two-way telemetering (station generation one way and system total generation the other way). 4. Transmission from the systetai operator's office to the station of automatically generated load-control signals used to increase or decrease automatically the station generation. 5. Two channels in each direction for future requirements. View full abstract»

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  • Relays and breakers for high-speed single-pole tripping and reclosing

    Page(s): 77 - 80
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    THE advantages of fast reclosing of transmission-line circuit breakers have been realized for a number of years. This experience has been gained on the basis of three-pole reclosures. One step beyond three-pole tripping and reclosure is single-pole operation. It is arranged so that on single phase-to-ground faults only the faulty phase wire is disconnected at each end of the line and then immediately reclosed. This allows synchronizing current to flow over the two sound-phase conductors during the time the faulted phase wire is out of service. With single-pole tripping slower speed reclosing, as compared to three-pole operation, can be utilized with a definite gain in the stability limit.1 View full abstract»

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  • High-speed single-pole reclosing

    Page(s): 81 - 87
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    THE first application of high-speed single-pole reclosing to a high-voltage transmission line was recently made, tested, and put in service, on a 50-mile section of 138-kv single-circuit line on the system of the Public Service Company of Indiana, Inc. This paper discusses the reasons for choosing single-pole reclosing, and the installation and field testing of the equipment made under operating conditions. A companion paper by S. L. Goldsborough and A. W. Hill1 describes the relaying and circuit-breaker equipment in detail. View full abstract»

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  • Evening courses at graduate levels — A challenge to colleges of engineering

    Page(s): 88 - 93
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    DURING the past months with the hysteria of war about us and with the nation struggling to convert its peacetime activities into a gigantic war-time arsenal of fighting and defense implements, the most urgent demands have been made for a trained personnel. The present dearth of technically trained workers and skilled artisans has been strongly felt in nearly every phase of this controversion of industry — ranging from the highest levels of engineering research and design, on through the vast varieties of supervisory positions in manufacture and inspection of materiel, and into the front line trenches of industry where plowshares are being turned into proverbial swords. View full abstract»

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  • Resistance-welding transients

    Page(s): 94 - 95
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    This paper discusses quantitatively the effect of indiscriminate (random phase-angle) switching in the primary of a resistance-welding transformer supplying a resistance welder. The current and power transients occurring because of “off-angle” switching are investigated through oscillographic records of transients in loads built up to simulate actual welder-head loads as nearly as possible. View full abstract»

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  • Shielding of substations

    Page(s): 96 - 99
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    AS compared to transmission lines, it is more important that overhead ground wires or vertical masts over substations be correctly located so as to provide shielding of the structure against direct strokes of lightning. In a previously published paper1 the authors discussed the shielding characteristics required for transmission lines. The present paper extends these investigations to the shielding of substations. 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