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Journal of the American Institute of Electrical Engineers

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • The story of the induction motor

    Publication Year: 1921, Page(s):203 - 223
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5906 KB)

    This paper covers the history of the technical side of the development of the induction motor, principally as the author saw it. It indicates the various stages of development from the early Tesla motor, with polar field construction, to the distributed field construction, and from the early wound-rotor type to the later almost universal cage type. Reference is made to the development of the cage ... View full abstract»

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  • Induction motor core losses

    Publication Year: 1920, Page(s):906 - 920
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3080 KB)

    An analysis of the core losses in induction motors is the object of the research described in this paper. The authors subdivide the core losses into six elements and point out that only one of the six is ordinarily calculated by designing engineers, with resulting large discrepancies between expectation and fact. The belief is expressed that to calculate other elements approximately is entirely fe... View full abstract»

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  • Polyphase reaction synchronous motors

    Publication Year: 1923, Page(s):1162 - 1168
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1247 KB)

    THE reaction synchronous motor in its present form (salient-pole rotor without field coils) is one of the oldest types of electric motors, antedating the induction motor by many years. At first it was used only in connection with instruments, such as the oscillograph etc.; later its simplicity and exactness in keeping in step made it the standard driving motor for rectifying devices such as are us... View full abstract»

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  • Cable geometry and the calculation of current-carrying capacity

    Publication Year: 1923, Page(s):525 - 539
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3144 KB)

    The main purpose of this article is to express the calculation of current-carrying capacity in simple formulas. The allowable current for underground cables is usually limited by the maximum permissible temperature of the insulation. The temperature rise is of course a function of the ability of the cable system to dissipate the heat generated. The chief difficulty in the calculation of current-ca... View full abstract»

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  • The Petersen earth coil

    Publication Year: 1922, Page(s):140 - 148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6336 KB)

    Accidental arcing grounds on transmission lines constitute the foremost problem to be solved in the transmission of electrical energy over great distances. There has come into use to a limited extent, arcing ground suppressors. This device consists in principle, of a switch in the station which is automatically closed in parallel with the accidental arc at any point out on the system. The parallel... View full abstract»

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  • Radio telegraphy

    Publication Year: 1922, Page(s):561 - 570
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5869 KB)

    The lecture first deals briefly with the early history of long distance radio communication. The work carried out by the engineers and experts of the Marconi Company in England with electron tubes or triode valves shows that, according to their experience, greater efficiency can be obtained at present by a number of bulbs used in parallel than by the employment of large single unit tubes. Informat... View full abstract»

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  • Physical interpretation of complex angles and their functions

    Publication Year: 1923, Page(s):155 - 164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2129 KB)

    A child's idea of an angle is a corner or edge; the sharper the corner or edge, the smaller is the angle, and hence expressions like “acute (sharp) angle,” “obtu e (blunt) angle,” etc. With a little schooling his idea of an angle is broadened into that of turning or rotation and finds a geometrical expression in a circle. The amount of turning is represented by the area... View full abstract»

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  • Magnetic and electrical properties of iron-nickel alloys

    Publication Year: 1920, Page(s):396 - 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3170 KB)

    Part 1. This investigation was undertaken to determine whether any iron-nickel alloys could be found having a higher saturation value than pure iron. Alloys were prepared containing 0–100 per cent Ni. Pure Fe-Ni alloys do not forge readily, and to make them forgeable it is necessary to add alloying elements like Mn or Ti. The results show that the saturation value decreases slowly with incr... View full abstract»

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  • Proximity effect in wires and thin tubes

    Publication Year: 1923, Page(s):961 - 970
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1473 KB)

    Formulas are given, with examples, for the following new problems in proximity effect resistance ratio: Thin Tube and Infinitesimal Wire; Two Thin Tubes in Return Circuit; Two Thin Tubes in Parallel; Insulated Cable Sheaths in Single-Phase Circuit; Cable Sheaths in Three-Phase Circuit, Flat Spacing; Finite Wire and Infinitesimal Wire; Two Wires in Parallel; Three-Phase Circuit, Triangular Spacing,... View full abstract»

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  • Textile printing: Its power requirements and electric drive

    Publication Year: 1922, Page(s):226 - 233
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4071 KB)

    Textile printing is the process of applying colored patterns and designs to all sorts of textile fabrics. The origin of the art dates back about 2000 years and credit for its discovery is given to both China and India. The present method of printing, known as cylinder or roller printing was invented and received its initial success about 1783–85. There are five methods used in textile print... View full abstract»

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  • Transmission line relay protection — II

    Publication Year: 1922, Page(s):839 - 852
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3320 KB)

    This paper is divided into three parts, the first part consisting of a list of relay nomenclature according to function and application, the second part being a general discussion on relay protection with special reference to an investigation of the Protective Devices Committee to obtain information on transmission line protective scheme and the third part, an illustrated description of the result... View full abstract»

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  • The physical nature of the electrical breakdown of solid dielectrics

    Publication Year: 1922, Page(s):1034 - 1044
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1904 KB)

    WHILE the physical phenomena in connection with the electrical rupture of gaseous insulators have been thoroughly investigated by J. J. Thomson, J. Stark, J. Townsend, J. B. Whitehead, F. W. Peek, Jr., and many others, the nature of the breakdown in solid and liquid insulating materials has up till now remained in complete obscurity. According to the prevailing opinion the rupture takes place at t... View full abstract»

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  • Shaft currents in electric machines

    Publication Year: 1923, Page(s):1325 - 1334
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4031 KB)

    This paper describes the causes of, and remedies for, the existence of “shaft currents” or “bearing currents” which sometimes flow across the rubbing surfaces of the bearings of electric machinery, thereby gradually damaging the shaft and bearings. Up to the present time the only cause of shaft currents that has attracted any particular attention has been the use of sec... View full abstract»

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  • The stroboscopic method of speed measurement

    Publication Year: 1922, Page(s):764 - 770
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3976 KB)

    EVERY engineer knows how difficult it is to make accurate speed measurements and how essential accuracy is in certain cases, for instance, in testing and experimental work. In practise, speed counters and tachometers are generally used. The first register the number of revolutions made by the machine in a given time and must be employed in connection with a time measuring device, usually a stop wa... View full abstract»

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  • Skin effect in large stranded conductors at low frequencies

    Publication Year: 1921, Page(s):757 - 763
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    The resistance of metallic conductors is higher for alternating currents than for direct currents, due to the so-called “skin-effect”. With alternating currents, the distribution is not uniform throughout the cross-section, there being a tendency for the current to concentrate towards the outside of the conductor, thus causing an increase of resistance and consequent increase of powe... View full abstract»

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  • Dielectric strength ratio between alternating and direct voltages

    Publication Year: 1923, Page(s):706 - 712
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    High-Voltage insulation testing has been and is usually still done by alternating voltages. High direct voltage was made available for testing purposes by the development of the kenotron tube. When used for testing insulation direct voltage has several advantages over alternating voltage. (1) the power necessary is often much less with direct voltage than with alternating voltage. In apparatus of ... View full abstract»

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  • The production of Porcelain for electrical insulation — VII

    Publication Year: 1923, Page(s):1096 - 1102
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7493 KB)

    Plant control check tests are of importance primarily to the manufacturers of a product. These tests are, however, of considerable importance to the consumer. The lower a manufacturer's losses are, the cheaper his production costs will be. As high losses are caused by defects in the product it is evident that the fewer pieces there are with noticeable defects in them, the fewer pieces there will b... View full abstract»

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  • The Edison effect and its modern applications

    Publication Year: 1922, Page(s):68 - 78
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5934 KB)

    WE are so accustomed to thinking of Thomas A. Edison as the father of the incandescent lamp and of the electric lighting industry that we sometimes forget that his first achievements were in the field of the electrical communication of intelligence, and that in this field he is no less distinguished. To say nothing of his inventions in multiplex and automatic telegraphy, it is well to recall that ... View full abstract»

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  • The measurement of power in polyphase circuits

    Publication Year: 1923, Page(s):205 - 218
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2973 KB)

    The object of this paper is to point out that the existing methods of measuring power when applied to unbalanced three-phase systems are not equitable for symmetrical polyphase machinery. On the other hand, unsymmetrical loads on polyphase systems are not sufficiently penalized for the trouble which they create in the system. It is first of all shown that a symmetrical generator cannot deliver pow... View full abstract»

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  • Features of the substation at the Hog Island Shipyard

    Publication Year: 1920, Page(s):807 - 808
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6343 KB)

    THE Hog Island Shipyard, near Philadelphia, Pennsylvania, constructed as a war measure, and which is known all over the world as one of the largest shipyards in existence, is operated throughout by electrical power purchased from the Philadelphia Electric Company and transmitted over a double-circuit, 66,000-volt stranded copper No. 00 tranmission line. There is also another single-circuit line op... View full abstract»

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  • Turbine reduction gears versus electric propulsion for ships

    Publication Year: 1921, Page(s):724 - 729
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1604 KB)

    The question of whether electric or geared propulsion should be used depends entirely upon the type and operating conditions of the vessel. The Navy Department after years of comparative study, and having actual operating data on electrically propelled vessels available, has decided to equip all the larger Navy vessels with electric drive. In this type of ship, electric drive has a decided advanta... View full abstract»

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  • A precise method of calculation of skin effect in isolated tubes

    Publication Year: 1923, Page(s):827 - 831
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1059 KB)

    A precise method of calculation is describ d for determining the skin effect in isolated tubular conductors. This may be used where more accurate results are desired than are given by the curves and approximate methods of calculation previously published by the writer. The present calculation requires the use of certain numerical values of Bessel functions, a table for which is given. Asymptotic s... View full abstract»

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  • The cooling of electric machines

    Publication Year: 1923, Page(s):1278 - 1288
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2127 KB)

    THE disposal of the heat resulting from the electrical and mechanical losses in any electric machine is always an important item to the designer as well as to the operator of the machine. These losses appearing all in the form of heat must be transferred from their source with a temperature gradient not to exceed the maximum safe operating temperatures. These maximum temperatures are limited by th... View full abstract»

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  • The wave antenna a new type of highly directive antenna

    Publication Year: 1923, Page(s):258 - 269
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7103 KB)

    Review of the Subject. — A small bungalow in a grove of oak trees just outside of Riverhead, Long Island, with a line of poles along a country road, carrying two copper wires, and ending by a stream nine miles southwest of Riverhead, — this in brief describes the Atlantic coast “ear” of the Radio Corporation of America, where the wireless messages from England, France, ... View full abstract»

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  • Maximum allowable working voltages in cables

    Publication Year: 1921, Page(s):12 - 22
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2336 KB)

    IN recent years there has been a marked tendency, temporarily interrupted by the war, to operate electric power cable at increasingly higher voltages. For these higher voltage cables, the electric stress, or voltage per unit thickness of insulation is much higher than for the lower voltage cables, because the limiting overall dimensions have necessitated a reduction in the factor of safety, partly... View full abstract»

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  • The design of air-core inductance coils of minimum weight for a given inductance and resistance

    Publication Year: 1920, Page(s):660 - 665
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    ANYONE familiar with the design of air-core inductances knows, that for a given resistance, the size and weight of the coil rapidly increase as the inductance is increased. Though the increased cost due to this increase in weight may not be of great importance, it is evident in many types of apparatus in which such coils play an essential part, as in portable radio sets, that both weight and size ... View full abstract»

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  • The dielectric strength of the vacuum: Electrostatic ionization gradient of metal electrodes

    Publication Year: 1922, Page(s):852 - 853
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    THE dielectric strength of air is 30 kv. per cm. at 0 deg. cent. and 76 cm. barometric pressure. It is proportional to the air density over a considerable range. It reaches a minumim in a moderate vacuum. Beyond this, it increases again, and in a very high vacuum reaches high values. much higher than at atmospheric pressure. View full abstract»

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  • Surface creepage and high-voltage insulation

    Publication Year: 1920, Page(s):949 - 959
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2208 KB)

    THE fundamental principle of designing high-voltage insulation, such as bushings, insulators etc., is obviously the application of electrostatics. A close examination of the evolution of the present methods of designing, however, will reveal the fact that it has been based very much upon experience rather than rational design. If the design were executed in rigorous accordance with the theory of e... View full abstract»

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  • Triple harmonics in transformers

    Publication Year: 1922, Page(s):351 - 359
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1957 KB)

    Although the prolbem of higher harmonics in the electrical circuits of transformers is a generation old and the solution has been given by a number of eminent engineers, still hardly a week passes in a department specializing on the manufacture of transformers that an instance does not appear of the lack of comprehension of the relations involved. If the problem were entirely confined to the realm... View full abstract»

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  • Skin effect and proximity effect in tubular conductors

    Publication Year: 1922, Page(s):203 - 209
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1540 KB)

    The effective a-c. resistance of tubular conductors is required to be predetermined by designers, for radio installations, for large underground cables with non-magnetic cores, and for electric furnace circuits. (See Examples I to IV). For the above purpose, sets of curves are given in this paper. The skin effect ratio for isolated tubes is shown in Fig. 1. For stranded conductors, the resistance ... View full abstract»

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  • Electrical appliances and lamps in residences

    Publication Year: 1923, Page(s):1217 - 1218
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1769 KB)

    A report of a committee of the Association of Edison Illuminating Companies presented in September, 1923, makes available information concerning the number of lamps and appliances in dwellings in the northeastern part of the country as ascertained through surveys conducted in 1921 and 1922. 1497 residences were surveyed in 1921 and 5015 were surveyed in 1922. The surveys were made in five cities i... View full abstract»

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  • Committee on electrochemistry and electrometallurgy

    Publication Year: 1922, Page(s):898 - 899
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    To the Board of Directors: This committee has not been active for some years, due principally to the facts that the subjects falling properly within its scope are more advantageously treated on the chemical and metallurgical sides than on the electrical, and have, therefore, been much more actively dealt with by some of the other engineering societies, notably the American Electrochemical Society ... View full abstract»

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  • Power factor correction on distribution systems

    Publication Year: 1920, Page(s):648 - 657
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2347 KB)

    POWER factor is a characteristic of electrical energy which is being transmitted by an impressed alternating voltage and resultant alternating current whereby it is possible for the current to rise and fall in magnitude before, with or after, the equivalent rise or fall in the alternating electromotive force. Tied up with this relative timing of voltage and current waves (which make up one pair of... View full abstract»

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  • A new equation for the static characteristic of the normal electric arc

    Publication Year: 1923, Page(s):12 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1410 KB)

    COMMERCIALLY the electric arc is now extensively used, and yet after more than a hundred years of study, there has been little crystallization of opinion as to certain phases of its fundamental theory. Absolute contradictions are frequently found in the literature, and premature generalizations have given rise to more disagreement among the investigators of the equation of the static characteristi... View full abstract»

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  • Radiation from transmission lines

    Publication Year: 1923, Page(s):95 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2150 KB)

    The aim of this investigation was to contribute something to our knowledge of traveling electromagnetic waves. Among the transient phenomena that occur along transmission lines, these are still little known, especially as far as their “attenuation” and “distortion,” or change in shape near the “wave front” are concerned. It is first seen that the “c... View full abstract»

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  • 220-Kv. Transmission: Southern California Edison company system, and some 220-Kv. researches

    Publication Year: 1922, Page(s):471 - 488
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10872 KB)

    The rapid growth in the demand for electric power and the increasing distances to which transmission is desirable, have constantly forced the use of higher transmission voltages. The Southern California Edison Company, having two single-circuit tower lines 241 miles long from its Big Creek hydroelectric plants to near Los Angeles, had the alternative of either duplicating these lines or of raising... View full abstract»

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  • General considerations in grounding the neutral of power systems: The neutral grounding reactor: Operating performance of a Petersen earth coil: Present day practise in grounding transmission systems: Systems transmitting at generated voltage: Systems transmitting at higher than generated voltage

    Publication Year: 1923, Page(s):1082 - 1087
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1656 KB)

    R. W. Atkinson: I want to say a word with regard to the comparison between the condition of a cable system and an overhead open-wire system with regard to the grounding of the neutral. There is a large and important difference for two reasons. The most important reason is the relative cost of insulation of the cable system as compared with the overhead cable for high voltage. The insulation is a v... View full abstract»

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  • Submarine detection in an alternating magnetic field

    Publication Year: 1920, Page(s):223 - 234
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2816 KB)

    The paper describes a series of tests of the disturbance caused in a uniform alternating magnetic field by an incoming magnetic mass looking to the development of a device for the detection of enemy submarines. Detection tests in the laboratory with submarine models 10 ft. long are in agreement with underlying theory and may be used as a basis for the design of larger equipment. Detection tests on... View full abstract»

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  • Heat losses in the conductors1 of alternating-current machines

    Publication Year: 1921, Page(s):398 - 410
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2051 KB)

    WITH the increase in the capacity of alternating-current generators, it has become more and more important to determine the exact relation between the heat developed in any conductor and the currents that it and other neighboring conductors carry. Solutions for the distribution of alternating current within conductors that are embedded in open rectangular slots have been obtained for a number of c... View full abstract»

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  • Description of the 45,000-Kv-a. Queenston generators

    Publication Year: 1922, Page(s):459 - 463
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3770 KB)

    Notwithstanding the very large rated capacity of the 45,000-kv-a. generators for the Queenston power house of the Hydro-Electric Power Commission of Ontario, their essential construction features are not different from those of much smaller rated generators. The generators are of the vertical shaft type with two guide bearings, and a thrust bearing. The thrust bearing is located above the stator a... View full abstract»

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  • The expression of dielectric losses in cables

    Publication Year: 1920, Page(s):55 - 56
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    DIELECTRIC losses in cables depend upon the characteristics of the current, the dimensions of the cable and the specific qualities of the insulation. In order to compare the specific qualities of different insulations with respect to dielectric losses, it is desirable to find a method of expressing these specific qualities independently of current characteristics and cable dimensions. This will pe... View full abstract»

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  • Polyphase power representation by means of symmetrical coordinates

    Publication Year: 1920, Page(s):543 - 544
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    THIS paper is a more complete presentation of the subject of power representation by means of symmetrical coordinates, which was briefly outlined in the author's paper on Symmetrical Co-ordinates presented at the 30th Annual Convention, 1918. View full abstract»

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  • A simple harmonic analyser

    Publication Year: 1920, Page(s):903 - 905
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    THIS paper describes a new mechanical integrator which it is hoped will fill a need, particularly among electrical engineers, for a simple inexpensive device of this nature. View full abstract»

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  • Voltage and current harmonics caused by corona

    Publication Year: 1921, Page(s):455 - 461
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4798 KB)

    THE FOLLOWING investigation was made to study the effects of corona in producing voltage and current harmonics in transmission systems. In the early work on corona in 1910 a very complete oscillographic study was made of voltage and current. It was found that the current wave of corona loss very much resembled the excitation current wave of a transformer or iron-core reactor. A typical corona wave... View full abstract»

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  • Transformers for interconnecting high-voltage transmission systems: For feeding synchronous condensers from a tertiary winding

    Publication Year: 1921, Page(s):483 - 489
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1387 KB)

    Owing to the advantages to be realized from the use of the star-star connection in interconnecting high-voltage transmission systems and from the fact that this connection requires the use of an auxiliary winding connected in delta to stabilize the neutral point or to decrease the inductance in the ground connection, a great majority of the transformers designed for interconnecting transmission li... View full abstract»

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  • Torque components due to space harmonics in induction motors

    Publication Year: 1922, Page(s):928 - 932
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    THE graphical method or circle diagram is undoubtedly the one most frequently employed in deriving speed-torque curves of induction motors from the design constants of the motor or from running and locked tests readings. In numerous papers and text books on induction motors are described quite a variety of circle diagrams, which have been developed for this purpose, each introducing more or less r... View full abstract»

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  • Ground selector for ungrounded three-phase distribution systems

    Publication Year: 1923, Page(s):311 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1877 KB)

    Ever since three-phase distribution has been known, a controversy has been going on with respect to the relative merits of grounded and ungrounded neutral. The inability of locating and isolating a ground fault is the chief disadvantage of the ungrounded neutral system, this being the reason why lately the grounded neutral has been given preference. The purpose of the so-called ground selector is ... View full abstract»

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  • Public address systems

    Publication Year: 1923, Page(s):347 - 358
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6289 KB)

    THIS paper aims to present the problems encountered in the development of electrical systems for amplifying the voices of public speakers and music; and to describe the equipment as brought to a commercial state and now in use in the United States and various other countries. View full abstract»

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  • The wave antenna: A new type of highly directive antenna

    Publication Year: 1923, Page(s):372 - 381
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1653 KB)

    Case II. Signal at an Angle to Antenna, Zero Loss Antenna. So far we have considered only signal waves traveling in the direction of the antenna. To calculate the directive properties of the antenna, we must find the effect of a signal of the same wave length and intensity coming at an angle to the antenna. In the first place there will be a difference in the electromotive force E0 indu... View full abstract»

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  • Operating performance of a Petersen Earth Coil

    Publication Year: 1923, Page(s):904 - 914
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2332 KB)

    This paper is a report on the Alabama Power Company's operating experience with a Petersen Earth Coil installed between the neutral and ground of a 120-mile, 44,000-volt, 3-phase, star-connected, 60-cycle system. A Petersen coil is essentially an inductive reactance of such value as to maintain resonance with the capacitance of the system to ground at the fundamental system frequency. With a groun... View full abstract»

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Aims & Scope

This Magazine ceased publication in 1923. The current retitled publication is IEEE Spectrum.

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