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BY
Prof. ERIC GERARD,

DIRECTOR of

L'Institut Electrotechnique Montefiore, University of Liege, Belgium.

TRANSLATED UNDER THE DIRECTION OF

LOUIS DUNCAN, PH.D.,

Johns Hopkins University.

With American Additions as follows: A Chapter on the Rotary Field,
by Dr. Louis Duncan; A Chapter on Hysteresis, by Charles
Proteus Steinmetz; A Chapter on Impedance, by
A. E. Kennelly; A Chapter on Units, by Dr.
Cary T. Hutchinson.

Cloth. Price, $2.50.

As a beautifully clear treatise for students on the theory of electricity and magnetism, as well as a résumé for engineers of electrical theories that have a practical bearing, the work of Professor Gerard has been without a rival in any language. As a text-book of reference it has been largely used in American colleges, the logical methods of the author and his faculty of lucid expression and illustration simplifying to students in a remarkable manner the understanding of the various subjects treated. The scope of the present translation has been limited to those parts of the original work treating of theory alone, as the practical portions would not have the same value for American students as for those to whom the book was originally addressed. In order to make it a treatise comprehensive of all electrical theory having a bearing on practical work, and to bring the subject-matter up to date, several chapters written by American authors are added. As will be sten above, the authors of these chapters are authorities on the several subjects with which they deal, and the work as thus extended forms the most complete treatise yet published relating particularly to electrical theory as it enters into the domain of the engineer.

Copies of this or any other electrical book published will be sent by mail, postage PREPAID, to any address in the world, on receipt of Arice.

The W. J. Johnston Company, Publishers, 253 BROADWAY, NEW YORK.

The Electrical World. An Illustrated Weekly Review of Current Progress in Electric

ity and its Practical Applications. Annual subscription............................ $3. Electric Railway Gazette. An Illustrated Weekly Record of Electric Railway Prac

tice and Development. Annual subscription. ........... . . . . . . . . . . . . . . . . . . . ...... 3.00 Johnston's Electrical and Street Railway Directory. Published annually........... 5.00 The Telegraph in America. By Jas. D. Reid. 894 royal octavo pages, handsomely

illustrated. Russia. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .............................. 7.00

Dictionary of Electrical Words, Terms and Phrases. By Edwin J. Houston, Ph.D.
Third edition. Greatly enlarged. 667 double column octavo pages, 582 illustrations, 5.00
The Electric Motor and Its Applications. By T. C. Martin and Jos. Wetzler. With
an appendix on the Development of the Electric Motor since 1888, by Dr. Louis
Bell. 315 pages, 353 illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ....... 3.00
The Electric Railway in Theory and Practice. The First Systematic Treatise on the
Electric Railway. By O. T. Crosby and Dr. Louis Bell. Second edition, revised
and enlarged. 416 pages, 183 illustrations. ........... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.50
Alternating Currents. . An o and Graphical Treatment for Students and En-
gineers. By Frederick Bedell, Ph.D., and Albert C. Crehore, Ph.D. Second edi-
tion. 325 pages, 112 illustrations . . . . . . . . . . . . . . . . . ................................... 2.50
Practical Calculation of Dynamo-Electric Machines. A Manual for Electrical and
Mechanical Engineers, and a Text-book for Students of Electro-technics. By A.
E. Wiener . . . . . . . . . . . . . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2.50
Gerard's Electricity. With chapters by Dr. Louis Duncan, C. P. Steinmetz, A. E.
Kennelly and Dr. Cary T. Hutchinson. Translated under the direction of Dr. Louis
Duncan . . . . . . . . . . - - - - - - - - - - - - - - - - - - - - -
Electrodynamic Machinery. By Edwin J. Houston, Ph.D., and A. E. Kennelly,
D.Sc.

The Theory and Calculation of Alternating Current Phenomena. By Charles

Proteus Steinmetz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 2.5 Central Station Bookkeeping. With Suggested Forms. By H. A. Foster ........... 2.50 Continuous Current Dynamos and Motors. An Elementary Treatise for Students. By Frank P. Cox, B.S. 271 pages, 83 illustrations........................... ....... 2.0 Electricity at the Paris Exposition of 1889. By Carl Hering. 250 pages, 62 illustrations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .00 Electric Lighting Specifications for the use of Engineers and Architects. Third edition, entirely re-written. By E. A. Merrill..... ................................... . 1.50 The Quadruplex. By Wm. Maver, Jr., and Minor M. Davis................ :......... 1.50

The Elements of Static Electricity, with Full Descriptions of the Holtz and Topler Machines. By Philip Atkinson, Ph.D. Second edition. 228 pages, 64 illustrations, 1.50

Lightning Flashes. A Volume of Short, Bright and Crisp Electrical Stories and

Sketches. 160 pages, copiously illustrated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.50 A Practical Treatise on Lightning Protection. By H. W. Spang. 18o pages, 28 illus- I trations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - - - - - - - - - - Electricity and Magnetism. Being a Series of Advanced Primers. By Edwin J. Houston, Ph.D. 306 pages, 116 illustrations.... . . . . . . . . . . . , - - - - - - - - - - - - - - - - - - - - - - - - 1.00 Electrical Measurements and Other Advanced Primers of Electricity. By Edwin J. Houston, Ph.D. 429 pages, 169 illustrations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Electrical Transmission of Intelligence and Other Advanced Primers of Electricity. By Edwin J. Houston, Ph.D. 330 pages, 88 illustrations. . . . . . . . . . . . . . . . . 1.00

Electricity one Hundred Years Ago and To-day. By Edwin J. Houston, Ph.D. 179

pages, illustrated...... ...................................... ....................... 1.00

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Alternating Electric Currents. By E. J. Houston, Ph.D., and A. E. Kennelly, D.Sc.

(Electro-Technical Series)........ ...... ................................ .... ..... 1.00

Electric Heating. By E. J. Houston, Ph.D., and A. E. Kennelly, D.Sc. (Electro

Technical Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ 1.00

Electromagnetism. By E. J. Houston, Ph.D., and A. E. Kennelly, D.Sc. (Electro

Technical Series).... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................ 1.00

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.Sc. (Electro-Technical Series)... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00

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Technical Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ 1.00

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Technical Series).... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00

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Technical Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00

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Technical Series)..... . . . . . . . . . . . . . . . . . . . . . . • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1.00

Alternating Currents of Electricity. Their Generation, Measurement, Distribution and Application. Authorized American edition. By Gisbert Kapp. 164 pages,

37 illustrations and two plates. . . . . . . . . . . . . . . . . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1.00 Electric Railway Motors. By Nelson W. Perry. 256 pages, many illustrations 1.00 Recent Progress in Electric Railways. Being a Summary of Current Advance in Electric Railway Construction, Operation;. Systems, Machinery, Appliances, etc. Compiled by Carl Hering. 386 pages, 11o illustrations . . . . . . . . . . . . . . . . ............. 1.00 Original Papers on Dynamo Machinery and Allied Subjects. Authorized American edition. By John Hopkinson, F.R.S. 249 pages, 90 illustrations.................. 1.00

Davis’ Standard Tables for Electric Wiremen. With Instructions for Wiremen and

Linemen, Rules for Safe Wiring, etc. Fourth edition. Revised by W. D. Weaver, 1.00

Universal Wiring Computer, for Determining the Sizes of Wires for Incandescent
Electric Lamp Leads, and for Distribution in General Without Calculation. By

Carl Hering. ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00

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By Nikola Tesla. 146 pages, 30 illustrations.... . . . . . . . . . . . . . . . . - - - - - - - - - - - - - - - - - - - 1.00 Lectures on the Electro-Magnet. Authorized American edition. By Prof. Silvanus P. Thompson. 287 pages, 75 illustrations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 1.00 Dynamo and Motor Building for Amateurs. With Working Drawings. By Lieutenant C. D. Parkhurst. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00 *Reference Book of Tables and Formulae for Electric Street Railway Engineers. By E. A. Merrill... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00 Practical Information for Telephonists. By T. D. Lockwood. 192 pages.... - 1.00 Wheeler’s Chart of Wire Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - ........ 1.00 A Practical Treatise on Lightning Conductors. By H. W. Spang. 48 pages, Io illustrations........................ . . . . . . . . . . . . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - . . . . .75 Proceedings of the National Conference of Electricians. 3oo pages, 23 Illustrations, .75 Tables of Equivalents of Units of Measurement. By Carl Hering.................. .50

Copies of any of the above books, or of any other electrical book published, will be

sent by mail, POSTAGE PREPAID, to any address in the world on receipt of price.

The W. J. Johnston Company, Publishers, 253 BROADWAY, NEW YORK.

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READ WHEREVER THE ENGLISH LANGUAGE IS SPOKEN.

THE ELECTRICAL WORLD

is the largest, most handsomely illustrated, and most widely circulated electrical journal in the world.

It should be read not only by every ambitious electrician anxious to rise in his profession, but by every intelligent American.

It is noted for its ability, enterprise, independence and honesty. For thoroughness, candor and progressive spirit it stands in the foremost rank of special journalism.

Always abreast of the times, its treatment of everything relating to the practical and scientific development of electrical knowledge is comprehensive and authoritative. Among its many features is a weekly Digest of Current Technical A lectrical Literature, which gives a complete résumé of current original contributions to electrical literature appearing in other journals the world over.

Subscription; including postage in the U. S., }$3 &l Year.

Canada, or Mexico.

May be ordered of any Newsdealer at 1o cents a week.

Cloth Binders for THE ELECTRICAL WORLD postpaid, $1.00.

(The W. J. Johnston Company, Publishers,
253 BROADWAY, NEW YORK.

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