Electrical Measurements and Other Advanced Primers of Electricity

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J.W. Johnston Company, limited, 1893 - Electric measurements - 429 pages
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Page 287 - A dynamo-electric machine is a machine for converting energy in the form of mechanical power into energy in tlie form of electric currents, or vice versa, by the operation of setting conductors (usually in the form of coils of copper wire) to rotate in a magnetic field, or by varying a magnetic field in the presence of conductors.
Page 446 - HERINC. 386 pages unit 120 illustrations. Cloth, - Price, $1.00 This volume contains a classified summary of the recent literature on this active and promising branch of electrical progress, with descriptions of new apparatus and devices of general interest. CONTENTS. Chapter I. — Historical. Chapter II. — Development and Statistics. Chapter III. — Construction and Operation. Chapter IV.— Cost of Construction and Operation. Chapter V. — Overhead Wire Surface Roads. Chapter VI. — Conduit...
Page 447 - Price, $2.60. While there are many monographs and special treatises on alternating currents, they are either fragmentary or special In character, or couched In mathematical language requiring a special mathematical education to Interpret. In this volume the theory of alternating currents Is, for the first time, treated In a connected and logical manner, and in mathematical language familiar to the ordinary mathematical public, while the graphica.1 extension can be followed by those not having a special...
Page 252 - ... simple mode of vibration from them. It is possible, but unlikely ; for atoms, even when isolated, have a multitude of modes of vibration special to themselves, of which only a few are of practical use to us, and we do not know how to excite some without also the others. However, we do not at present even deal with individual atoms. We treat them crowded together in a compact mass, so that their modes of vibration are really infinite.
Page 451 - This collection of papers includes all written on electro-technical subjects by the distinguished author, most of which have been epochal in their character and results. The papers are arranged according to subject. Five papers relate wholly or in part to the continuous current dynamo ; four are on converters and one each on the theory of alternating current machines and on the application of electricity to light-houses. In the words of the author "The motive of this publication...
Page 442 - Some idea of the scope of this important work and of the immense amount of labor involved in it, may be formed when it is stated that it contains definitions of about 6000 distinct words, terms, or phrases.
Page 252 - However, we do not at present even deal with individual atoms; we treat them crowded together in a compact mass, so that their modes of vibration are really infinite. We take a lump of matter, say a carbon filament or a piece of quicklime, and by raising its temperature we impress upon its atoms higher and higher modes of vibration, not transmuting the lower into the higher, but superposing the higher upon the lower, until at length we get such rates of vibration as our retina is constructed for,...
Page 251 - We want a certain range of oscillation, between 7000 and 4000 billion vibrations per second : no other is useful to us, because no other has any effect on our retina ; but we do not know how to produce vibrations of this rate. We can produce a definite vibration of one or two hundred or thousand per second ; in other words, we can excite a pure tone of definite pitch ; and we can command any desired range of such tones continuously by means of bellows and a keyboard. We can also (though the fact...
Page 446 - Motors and Trucks. Chapter XII. — Accessories. Copies of this or any other electrical book or books published, will be promptly mailed to any address in the world, POSTAGE PREPAID, on receipt of price. Address The WJJOHNSTON COMPANY, Ld., TIMES BUILDING, NEW YORK.
Page 449 - Introduction, by William Stanley, Jr. Chap. I. Introductory. Chap. II. Measurement of Pressure, Current and Power. Chap. III. Conditions of Maximum Power. Chap. IV. Alternating Current Machines. Chap. V. Mechanical Construction of Alternators. Chap. VI. Description of Some Alternators. Chap. VII. Transformers. Chap. VIII. Central Stations and Distribution of Power. Chap. IX. Examples of Central Stations. Chap. X. Parallel Coupling of Alternators. Chap. XI. Alternating Current Motors. Chap. XII. Self-Starting...

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