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American Institute of Electrical Engineers, Proceedings of the

Issue 8 • Date Aug. 1915

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Displaying Results 1 - 25 of 30
  • Panama-Pacific Convention, and International Engineering Congress

    Publication Year: 1915 , Page(s): 183 - 187
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    Freely Available from IEEE
  • A. I. E. E. mortgage paid

    Publication Year: 1915 , Page(s): 187 - 188
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    Freely Available from IEEE
  • Amendment to by-law providing for student enrolment

    Publication Year: 1915 , Page(s): 188
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    Freely Available from IEEE
  • Deer Park convention

    Publication Year: 1915 , Page(s): 188 - 193
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  • Directors' meeting, Deer Park, Ma., July 1, 1915

    Publication Year: 1915 , Page(s): 193
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  • Past section and past branch meetings

    Publication Year: 1915 , Page(s): 193 - 195
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  • Personal

    Publication Year: 1915 , Page(s): 195
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    Freely Available from IEEE
  • Membership

    Publication Year: 1915 , Page(s): 195 - 199
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  • Employment department

    Publication Year: 1915 , Page(s): 200 - 201
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  • Library accessions

    Publication Year: 1915 , Page(s): 202 - 203
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  • Officers and Board of Directors, 4916–1916

    Publication Year: 1915 , Page(s): 204 - 206
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  • The trend of electrical development: President's address

    Publication Year: 1915 , Page(s): 1491 - 1502
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  • How Bell invented the telephone

    Publication Year: 1915 , Page(s): 1503 - 1513
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    IT IS my privilege and pleasure to speak to you of the invention of the telephone, with which event it was my good fortune to be connected, my association with Prof. Bell as his mechanical expert having brought me into close touch with nearly all his experiments both before and after his great discovery. I shall try to tell the story as it impressed itself on my mind in those early days when I was a young man of about 20, just out of my apprenticeship as a maker of electrical apparatus, intensely interested in my work, and with a full share of youthful enthusiasm. In my story, I shall not use the terms and formulas of modern telephony, for they would certainly be out of place in speaking of the time when that science, now so complex, was contained in one human brain. View full abstract»

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  • Standard Marine electrical installations

    Publication Year: 1915 , Page(s): 1515 - 1548
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    The requirements of merchant and naval installations are cited in brief. The rules of the classification societies are reviewed and present practise is fully discussed. Then follows the specific applications to a number of different types of ships including both merchant and naval vessels. The reasons for the application of electric propulsion to a battleship are briefly given. View full abstract»

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  • Overhead electrolysis and porcelain strain insulators

    Publication Year: 1915 , Page(s): 1549 - 1558
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    There is a slight leakage of current from trolley wires to earth through insulated supports on all electrical overhead construction, which if not checked permits a flow of current which gives rise to electrical separation of water into oxygen and hydrogen. The oxygen liberated acts vigorously upon the adjacent metal parts which in time become badly corroded. This electrolytic action also seems to remove the galvanizing from live metal parts before attacking the iron. A partial remedy for this rusting of live galvanized wire is painting. This electrolytic effect is also seen to take place over strain insulators where the creepage distance is insufficient. This indicates that a creepage distance proportional to the conditions met must be secured to stop the flow of current around the outside of the insulators. The author concludes that, under fog conditions, the insulator surface exposed for creepage is insufficient in our present standard devices. Another form of overhead electrolytic action noticed in electric railway work is caused by use of dissimilar metals in contact. Sulphuric acid and other fumes in the air, and ozone from a nearby ocean, are supposed to be the electrolytes that set up a local battery action at these points of contact. The logical remedy for this trouble is to use similar metal in contact. The paper then describes the troubles encountered in San Francisco due to these causes and the remedies which have been applied. View full abstract»

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  • Physical limitations in D-C. commutating machinery

    Publication Year: 1915 , Page(s): 1559 - 1614
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    In direct-current machines, there are a number of apparently distinct limitations, such as sparking at brushes, flashing at the commutator, burning and blackening of the commutator face, picking up of copper, etc. which, in reality, are very intimately related to each other. The principal object of the paper is to bring out such relationships and to show that all these actions are special cases of well known phenomena. The theory of commutation is considered only in its relation to the e.m.fs. generated in the coils short circuited by the brush; and the limiting e.m.fs. per commutator bar and per brush are shown to be fixed principally by brush contact resistance. The effects of the negative coefficient of the contact resistance is also referred to briefly. Flashing due to various causes is next taken up, and the relations between the maximum volts per bar and flashing conditions is indicated, both from test and general experience. Flashing due to various other causes, such as interrupting the circuit, etc. is also considered. Burning and blackening of commutators, high mica, picking up of copper, etc. are treated in detail, and these actions are shown to be very closely related to the commutation limits derived in the earlier part of the paper. Noise, vibration, etc. are also considered as limitations in design of d-c. apparatus. In approaching the ultimate design, these limitations become increasingly prominent. Flickering of voltage and winking of lights are two well-known actions in direct-current practise. A simple explanation of the winking of lights (not original with the author) is given with the results of tests on a generator with well proportioned compensating windings in the pole faces. Apparently the difficulty is a fundamental one, and is liable to occur in all types of d-c. machines. In conclusion, a brief chapter is given on design limitations as fixed by commutator peripheral speed. This applies particularly to large capacity high-voltage machines.- An appendix is added covering a method for determining the maximum capacity of d-c. machines in terms of the short circuit volts per commutator bar when the various constants in the machine are given certain limiting values. The results show that in large high-speed machines, the maximum capacity is considerably above present practise. View full abstract»

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  • The modern electric mine locomotive

    Publication Year: 1915 , Page(s): 1615 - 1620
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    The day of the small mine with small equipment is passing, and in the future most of the bituminous coal mining will be accomplished in larger mines using heavy equipment. The demand for larger capacity in equipment has been increasing rapidly of late, and owing to the restricted space available for the equipment on a mine locomotive, difficulty is being experienced in designing equipment to meet the conditions. A possible solution of the problem is in providing forced ventilation for the motors which are of a type that require very little ventilation to produce a large increase in the continuous rating. This scheme has been tried out on a large locomotive and the results indicate that forced ventilation will play a prominent part in meeting the extreme severe conditions that are frequently arising in the mine locomotive field. View full abstract»

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  • Abnormal voltages in transformers

    Publication Year: 1915 , Page(s): 1621 - 1656
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    This paper deals with the electrical behavior of transformer windings when subjected to steep wave fronts and high-frequency wave trains. The dependance of the internal voltages produced, upon the distribution of capacity with the inductance of the winding is discussed. Practical windings are divided into two general classes, one in which inductance and capacity are practically uniformly distributed, and the other in which the capacity is more or less concentrated at certain points, with relatively concentrated portions of inductance intervening. Neglecting the effects of the high frequency dielectric losses in the insulation at high frequency, distinct mathematical analysis is given to these two classes of winding to determine the ratios of the internal voltages to the voltage of the external wave or wave train. The resulting internal voltage distributions are plotted for various frequencies, and curves are plotted for the relations of maximum internal voltages to frequency. These curves show that some frequencies are dangerous, while others are not, but it can not be said that one of these types of winding is better than the other from the standpoint of the possibility of excessive internal voltages. The analysis is by no means complete, but an examination is made of the facts and fundamental principles involved which will enable us to insulate for and guard against excessive internal voltages in a more scientific manner. View full abstract»

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  • Harmonics in transformer magnetizing currents

    Publication Year: 1915 , Page(s): 1657 - 1673
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    The purpose of this paper is to show in a concise manner the cause and effects of higher harmonic currents in magnetizing currents of transformers. A hypothetical case is analyzed to show the cause of the harmonics; then the schemes of connecting transformers that are commonly used for polyphase transformation are taken up and the effects of the harmonics on each case pointed out. The author also shows the reason why third harmonic voltages are not developed in the three-phase “core type” transformer when connected star-star. View full abstract»

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  • Phenomena accompanying transmission with some types of star transformer connections

    Publication Year: 1915 , Page(s): 1675 - 1681
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    The purpose of this paper is to demonstrate the phenomena attending the operation of star-star transformers with grounded neutral on the line side. Contrary to current opinions, the author believes the abnormal voltages and destructive effects, which often accompany star-star operation, are due to even harmonics, at least in a large number of cases. At high magnetic densities, the third harmonic voltage may be appreciable, but the indications are that' the even harmonics will cause damage at nominal magnetic densities lower than those which require appreciable third harmonic exciting current. The data on which the conclusions are based, include approximately 150 oscillogram waves and a correspondingly large number of meter readings. The data are omitted from the text to a large extent, because the details could not add materially to the discussion. The tests are simple and can easily to made with an oscillograph in any laboratory or substation. One precaution must be kept in mind, namely that the observations should start at low voltages, which may be increased gradually until the various phenomena are observed. Unless this is done, the equipment may be wrecked. View full abstract»

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  • Delta-cross connections of transformers for parallel operation of two- and three-phase systems

    Publication Year: 1915 , Page(s): 1683 - 1694
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    Two methods of transformer connections, the tee-cross and the delta-cross, are described with their application for parallel operation of two-phase and three-phase systems. An attempt is made to explain as clearly as possible the voltage, current and phase relation, and the dephasing action which take place in each case. The delta-cross system of connections lends itself to a great number of applications, either for the parallel operation of two-phase and three-phase systems or for the simultaneous supply of two-phase and three-phase power from one bank of transformers. It is to be noted that in this system of connections no special taps are required, except a 50 per cent tap on one transformer (usually easily obtainable), the compensation of one phase of the system being done externally by means of a small booster transformer. The simplicity of connections, the feature that no special transformers are required, and no special taps necessary, give the electrical engineer facilities to meet promptly and economically the requirements inherent to two-phase and three-phase simultaneous distribution from only one transformer bank. View full abstract»

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  • The effect of transient voltages on dielectrics

    Publication Year: 1915 , Page(s): 1695 - 1747
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    The author wishes to acknowledge indebtedness to Mr. B. L. Stemmons for his skilful assistance in making experiments and calculations. See Hayden and Steinmetz — Disruptive Strength with Transient Voltages, Trans. A. I. E. E., 1910. View full abstract»

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  • Experimental researches on skin effect in conductors

    Publication Year: 1915 , Page(s): 1749 - 1814
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    1. Discussion on the paper of Dr. J. A. Fleming, “On Some Effects of Alternating-Current Flow in Circuits having Capacity and Self Induction,” Journal Institution of Electrical Engineers, London, Vol. XX, May 1891, p. 471. The results are given of about one hundred series of tests, each covering a range in frequency up to about 5000 cycles per second, on the impedance of long loops of parallel conductors of different metals, sizes, and cross-sectional forms. The measuring apparatus is detailed. The theory of the skin effect in solid rods and in indefinitely wide flat strips is appended in a new and simplified form. View full abstract»

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  • Deisel engines for generator drive

    Publication Year: 1915 , Page(s): 1815 - 1818
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    The author describes some investigations made in Europe of Diesel engines of large capacity, with a view to their suitability for driving generators of 500 to 1000 kw. capacity under conditions prevailing in mining camps in the Southwest. View full abstract»

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  • A large electric hoist

    Publication Year: 1915 , Page(s): 1819 - 1827
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    The paper describes an electric hoist recently installed in a mine at Butte, Mont., having a depth of shaft of 4000 ft., net weight of load 14,000 lb., weight of skip and cage, 9000 lb. and maximum hoisting speed 3000 ft. per, min. Some results of operations are given. This hoist is of special interest as being the largest electric hoist in the world and containing some important departures from previous practise. View full abstract»

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Aims & Scope

This Magazine ceased publication in 1919. The current retitled publication is IEEE Spectrum.

Full Aims & Scope