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Electrical Engineering

Issue 12 • Date Dec. 1953

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Displaying Results 1 - 25 of 55
  • [Front cover]

    Publication Year: 1953 , Page(s): c1
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    Freely Available from IEEE
  • [Advertisement - Front inside cover]

    Publication Year: 1953 , Page(s): c2
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  • Contents

    Publication Year: 1953 , Page(s): 1
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  • [Advertisements]

    Publication Year: 1953 , Page(s): 2A
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  • Highlights

    Publication Year: 1953 , Page(s): 3A
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  • [Advertisements]

    Publication Year: 1953 , Page(s): 4A - 12A
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  • Atomic power in Ohio

    Publication Year: 1953 , Page(s): 1047 - 1051
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    SINCE August 6, 1945, when the atom first burst on the world's consciousness with the bomb which rocked Hiroshima, the State of Ohio has contributed enormously to the development of the atom. Up to now, most of that development has had for its object a strengthening of our defenses. That continues to be of paramount importance. Yet we also continue to hope that the atom will justify the sweat and toil that have been invested in it by leading to useful and significant peacetime applications for the benefit of the people of this state and nation, and the world. Before getting into a discussion of the prospects for realizing that hope, you may be interested in a brief review of what work Ohio has done on the atom. View full abstract»

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  • Numerical solutions for temperature fields in electric coils

    Publication Year: 1953 , Page(s): 1052
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    THE MAXIMUM PERMISSIBLE electric loading of a coil is restricted by the allowable temperature rise in the coil cross section. In order to establish this peak loading, the designer must compute the maximum temperature or general temperature distribution that is peculiar to each new cross-section profile under design loading. A technique for computing these general temperature fields t(x, y) which combines simplicity with both flexibility and accuracy is the numerical-relaxation method of Emmons and Southwell. View full abstract»

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  • Stereophonic recording equipment

    Publication Year: 1953 , Page(s): 1053 - 1056
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    It is inevitable that man in his progress of communications from talking, telephoning, aural and visual broadcasting by radio, should go back a bit to do something more than merely transmit intelligence. This is about a refinement: reproducing recorded sound more faithfully than heretofore. View full abstract»

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  • Overload relays and circuit breakers for protecting motorized appliances and their branch circuits

    Publication Year: 1953 , Page(s): 1056 - 1060
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    After presenting the causes of motor overheating, thermal overload relays are discussed with bimetal-type or solder-film types being preferred. Short-circuit protection then is examined and molded-case air circuit breakers are suggested for use with most domestic- and industrial-type branch circuits to which motorized appliances are to be connected. View full abstract»

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  • Mine-trailing cables

    Publication Year: 1953 , Page(s): 1061 - 1065
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    Mine-trailing-cable construction is discussed with the cables being divided into five groups having characteristically different construction. The four principal types of damage to these cables are given together with ways of identifying the damage and both preventive and remedial measures. View full abstract»

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  • Frequency and fluorescent lamps

    Publication Year: 1953 , Page(s): 1066 - 1070
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    Although 60-cycle alternating current is almost universally employed for lighting purposes in this country, fluorescent lamps can be operated more economically on higher frequencies and at the same time their light output and life are increased. View full abstract»

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  • Modern forced-air cooling of power transformers

    Publication Year: 1953 , Page(s): 1071 - 1075
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    The available types of forced-air fans and control methods, their application to power transformers, and the advantages of each type for specific installations are discussed. View full abstract»

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  • Noise and crosstalk control on N1 carrier systems

    Publication Year: 1953 , Page(s): 1075 - 1080
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    The most important sources of noise system noise, secondary induction from telephone plant and external sources, and nonsoldered cable pair joints are discussed together with the methods of alleviating the trouble. Although control of crosstalk had been facilitated by the Nl system design, it still has to be dealt with in connection with transverse crosstalk, crosstalk in lateral cables, and interaction crosstalk at repeaters and at terminals. View full abstract»

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  • A low-height 15-ton mine locomotive

    Publication Year: 1953 , Page(s): 1081
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    WITH THE ADVENT of mechanical mining it has become possible to mine coal from seams formerly considered too narrow for practical working. As a result, locomotive designers had to produce a haulage locomotive, big enough to handle the production of coal in seams 30 to 42 inches high. Moreover, the locomotive must conform to the requirements for standard haulage-type locomotives as regards high continuous tractive effort, latest traction motor design, sturdy construction, accessibility of equipment, and capability to accelerate a train. View full abstract»

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  • Generator relaying for single-axis short circuits

    Publication Year: 1953 , Page(s): 1082
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    FOR FEAR that overcurrent relays might trip off the unit on overload when it is needed most, generators are usually not provided with relays to respond to balanced external faults. This is satisfactory practice because balanced faults on the system can be tolerated by the generator for an appreciable time. However, experience now indicates that the more closely designed modern generators should be provided with relays to detect the presence of unbalanced external faults that are not cleared in a proper time, since these may result in damage to the generator. View full abstract»

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  • Economic factors of small-capacity hydroelectric stations

    Publication Year: 1953 , Page(s): 1083 - 1088
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    The use of induction generators in semioutdoor plants, simple relay and water-wheel controls, and fully automatic features has reduced materially the plant investment, operating, and maintenance costs, thus making the use of small hydroelectric sites more desirable. The economic aspects of two actual induction generator plants are described. View full abstract»

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  • Design of transformers for resistance welding machines

    Publication Year: 1953 , Page(s): 1088 - 1093
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    A DISCUSSION OF transformer design and characteristics would have been a rather controversial subject 15 years ago, as in those days the name-plate kilovolt-ampere rating of the transformer meant little other than that it was printed in English. Oftentimes in the early years, if the power companies limited the maximum connected kilovolt-amperes for a particular installation, a machine was supplied with this name-plate kilovolt-ampere rating, regardless of the actual load drawn by the machine. It was rather common practice to use excessive amounts of copper in the secondaries and a very small amount of primary copper. There was no logical reason for this except perhaps that the secondaries could be seen while the primaries were covered. In general, confusion existed, no standard ratings were used, and it was extremely difficult for power companies or users to determine actual ratings and demand figures. This condition of course could not continue and several years ago the AIEE and the Resistance Welder Manufacturers' Association (RWMA) drew up specifications for the standardization of welding transformer ratings. View full abstract»

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  • Maintenance of transmission lines by helicopter

    Publication Year: 1953 , Page(s): 1094
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    SUCCESSFUL USE of the transport helicopter in Korea and in the Canadian Rockies of British Columbia is focusing attention on the potentialities of this craft as a transport vehicle. With such successful operations in mind, a study was indicated of the feasibility of using a commercially available 8-passenger 1,500-pound payload-carrying transport helicopter for transmission-line maintenance and repair work. The system studied was the 1,558-mile transmission system of the Parker-Davis Project of the Bureau of Reclamation, in Arizona, California, and Nevada. View full abstract»

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  • Resistance bridge sensitivity and output formulas

    Publication Year: 1953 , Page(s): 1095
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    CONVENIENT FORMULAS for current and voltage in the detector branch of a resistance bridge are shown in Figures 1 to 3. These formulas are particularly useful for determining either the exact sensitivity of the balanced bridge or the approximate output of the unbalanced bridge where the unbalance is, in general, not greater than the order of 10 per cent. In either case, the user is assumed to be referring to and working from the balanced-bridge condition. The proportional error of the output approximation, based on the exact output value, does not exceed the proportional unbalance of the bridge (for example, no more than a 1-per-cent error results if the bridge is out of balance by 1 per cent). It does not matter whether the values of V, I, C, T, S, and D are taken from the balanced or from the unbalanced bridge, although it is more convenient to take them from the former. The formulas in Figure 3 are of course not new, being merely representations of Thevenin's Theorem, but they nonetheless belong in this group to complete the logical assembly of formulas. View full abstract»

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  • Economic thermal-hydroelectric system operation

    Publication Year: 1953 , Page(s): 1096
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    THE THEORY and practice involved in the economic scheduling of thermal plants, including the effects of transmission losses, has been well developed in recent years. This article presents a method for short-range optimum economic scheduling of a thermal-hydroelectric power system with transmission losses rigorously considered. View full abstract»

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  • Magnetic amplifier performs analytical operations

    Publication Year: 1953 , Page(s): 1097
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    THE CIRCUIT shown contains two saturable reactors with “square loop” cores. An alternating voltage is applied to their windings through rectifying diodes. During positive half-cycles of the supply voltage Vc the core flux of the converter stage rises from some preset value to saturation. Before “firing” only a small magnetizing current flows; after firing the supply voltage appears across the load resistance Rc and the winding resistance rc. The preset flux is determined jointly by the line voltage, which in negative (presetting) half-cycles tries to remove the core from positive saturation and by the opposing voltage of a given half-wave sinusoidal signal Vs1 1 This stage converts the waveform of the signal Vs1 into a net output waveform Vc ′ of nearly equal half-cyclic area. View full abstract»

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  • System grounding in industrial plants

    Publication Year: 1953 , Page(s): 1098 - 1103
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    Some of the reasons why grounding is important are discussed together with various methods for satisfactory neutral grounding of 3-phase a-c systems in industrial plants. View full abstract»

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  • Differential reactive current protection relay

    Publication Year: 1953 , Page(s): 1104
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    A PROTECTIVE DEVICE which the author has called a differential reactive current protection relay (DRCPR) was developed for use in an aircraft a-c electric system, as a solution to a number of problems associated with reactive load division. This protective device is equally applicable to any system of paralleled alternators with automatic voltage regulation. View full abstract»

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  • Impedance transformations in band-pass filters

    Publication Year: 1953 , Page(s): 1105
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    Design of band-pass impedance transforming filters is derived from Norton's1 equivalence between a dissymmetrical band-pass filter and a symmetrical section plus an ideal transformer. This equivalence is illqstrated for a T section in Figure 1. 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