SCIENCE.— AD VERTISEMENTS. 



SOME OF THE PUBLICATIONS 



OF 



The W. J. Johnston Company 



The Electrical World. 



An Illustrated Weekly Review of Current Progress in 

 Electricity and its Practical Applications. Annual sub- 

 scription. ?3.00 



Dictionary of Electrical Words, Terms 

 and Phrases. 



By Eilwiu J. Houston, Ph.D. Fourth edition. Greatly 

 enlarged. 10,04:; words and terms defined : 12,073 defini- 

 tions ; 990 double column octavo pages; 582 illustrations, 

 an indispensable reference book, not only for electri- 

 cians, but for everyone interested in current progress. 



S7.00 



Shop and Road Testing of Dynamos and 

 Motors. 



By Eugene C. Parhnm and John Shedd. Practical and 

 thorough. '' 526 pages. S2.00 



Electro=Dynamic Machinery. 



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

 text-book on continuous-current dynamo-electric ma- 

 chinery for electric-engineering students of all grades. 

 331 pages, 232 illustrations. S2.50 



Practical Calculation of Dynamo=Elec= 

 trie Machines. 



A Manual for Electrical and Mechanical Engineers, and 

 a Text-book for Students of Electrotechnics. By. A. E. 

 Wiener. 683 pages, 375 illustrations. $2.50 



Gerard's Electricity. 



With chapters by Dr. Louis Duncan, C. P. Steinmetz, A. 

 E. Kennelly and Dr. Gary T. Hutchinson. Translated 

 under the direction of Dr. Louis Duncan. 392 pages, 112 

 illustrations. As a beautifully clear treatise for students 

 on the theory of electricity and magnetism as vf ell as a 

 rt'sum6 for engineers of electrical theories that have a 

 practical bearing, the work of Professor Gerard has been 

 without a rival in any language. S2.60 



Electrical Power Transmission. 



By Dr. Louis Bell, Ph,D. Uniform with Crosby & Bell's 



"El ■ - - ■ ■■ 



ter. 



The Theory and ©alculation of aiter= 

 nating Current Phenomena. 



Bv Chas. Proteus .Steinmetz. Contains the very latest 

 knowledge relating to alternate current phenomena, 

 much of which is original with the author, and here ap- 

 pears for the first time in book form. $2.50 



Electric Lighting Specifications. 



For the use of Engineers and Architects. Third edition 

 entirely re-writteh. By E. A. Merrill. 231 pages. 81.50 



Electricity ©ne Hundred Years Hgo and 

 To=day. 



By Edwin J. Houston, Ph.D. 190 pages, illustrated. Jl.OO 



Hlternating Electric Surrents. 



Bv E. J. Houston, Ph.D., and A. E. Kennelly, D.Sc. 

 (Electro-Technical Series.) Sl-OO 



Electric Heating. 



By E. J, Houston, Ph.D., 

 (Electro-Technical Series.) 



Magnetism. 



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

 (Electro-Technical Series.) 81.00 



Electro=Therapeutics. 



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

 New Edition. Enlarged by addition of chapter on X- 

 Eays (Electro-Technical Series). $1.00 



Electric arc Lighting. 



Bv E. J. Houston, Ph.D.. and 

 (Electro-Technical Series.) 



Electric Incandescent Lighting. 



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

 (Electro-Technical Series.) $1.00 



The Electric Motor. 



By E. J. Houston, Ph.D., 

 (Electro-Technical Series.) 



Electric Street Railways. 



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

 (Electro-Technical Series.) $1,00 



The Electric Telephone. 



Bv E. J. Houston, Ph.D., and A, E. Kennelly, D.Sc. 

 (Electro-Technical Series.) $1.00 



Electric Telegraphy. 



Bv E. J. Houston, Ph.D., and A. E. Kennelly, D.Sc. 

 (Electro-Technical Series.) $1.00 



Alternating Electric Currents. 



Their Generation, Measurement, Distribution and Ap- 

 plication. Authorized American edition. By Gisbert 

 Kapp. 166 pages. 37 illustrations, 2 plates. $1.00 



Electric Railway Motors. 



By Nelson W. Perry. 256 pages. Many illustrations. 



$1.00 



Original Papers on Dynamo Machinery 

 and allied Subjects. 



Experiments with alternating Currents 

 of High Potential and High Frequency. 



By Nikola Tesla. 146 pages. 35 illustrations. $1.00' 



Lectures on the Electro=Magnet. 



Authorized American edition. By Professor Sylvanus 

 P. Thompson. 2S7 pages. 75 illustrations. $1.00 



Dynamo and Motor Building for ama= 



teurs. 



Copies of any of the above books, or any otlier electrical boolc published, will be sent by mail, 

 PO.STAGK PKEPAID, to any address in the Avorld, on receipt of .price. 



THE W. J. JOHNSTON COMPANY, 9 Murray Street, New York 



