SCIENCE 



N3EW Series. 

 Vol. III. No. 55. 



Friday, January 17, 1896. 



Single Copies, 15 cts. 

 Annual Subscription, $5.00 



Just 

 rubusheex, 



A Complete 

 Electrical Library. 



By Prof. T. O'Conor Sloane. The best 

 Electrical Books. Each sold separately. 

 How to Become a Successful Electrician. 



Illustrated, §1.U0. 

 It is the ambition of thousands of young and old to become 

 electrical engineers. Not every one is prepared to spend sev- 

 eral thousand dollars upon a colletje course, even if the three 

 or four years requisite are at iheir disposal. It is possible to. be- 

 come an electrical engineer without this sacritice, and this work 

 is designed to tell "How to Become a Successful Electrician," 

 without the outlay usually spent iu acquiring the profession. 

 Electricity Simplified. 



Third Edition. Fully Illustrated, $1.00. 

 This work is the simplest published on the subject of Elec- 

 tricity, and does somethini; not hitherto accomplished. Elec- 

 tricity is in many respects unexplained by the scientist ; to the 

 or^iinary man it is a mystery. The object of "Electricity Simpli- 

 fied " is to make the subject as plain as possible. 



"This is an excellent little book, well worth perusal. *:;=* The 

 book is practical in the best sense of the word. The author is to be 

 commended for producing such a work."— £';eciric«^ Engineer. 

 Arithmetic of Electricity. 



Fourth Edition. Illustrated, §1.00. 

 A practical treatise on Electrical Calculations of all kinds, re- 

 <iuced to a series of ruli s, all of the simplest forms and involv- 

 ing only ordinary arithmetic; eacli rule illustrated by one or 

 more practical problems, with detailed solution of each one. 

 Followed by an extensive series of Tables. 



" We can recommemi the work." — Electrical Engineer. 

 Electric Toy=Making, Dynamo Building: and Electric- 



Motor Construction. Very fully illustrated, $1.00. 

 This work treats of the making at home of Electrical Toys, 

 Electrical Apparaius, Motors, Dynamos and Instruments in gen- 

 eral, and is designed to bring within tiie reach of young and old 

 the manufacture of genuine and useful electrical appliances. 

 The work is specially designed for amateurs and young folks. 

 standard Electrical Dictionary. 



624 pages, 350 illustrations. Cloth, 8vo, $3.00. 

 The work is absolutely Indispensable to all in any way inter- 

 ested in ' Electrical Science,' from the higher electrical expert to 

 the every-day electrical workman. In fact, it should be in the 

 possession of all who desire lo keep abreast with the progress of 

 the greatest science of the times. 



" Any student who will spend his leisure hours over the volume 

 will be amply repaid for his time and trouble. The book is very 

 deary printed in bold type, on good paper and is well bound. ^*:^" 

 — Electrical Engineer. 



"The title of this work hardly does it justice— it is more than a 

 dictionary ; it is a practical handbook of reference, in which the 

 terms and subjecis are arranged alp 'labetically, and besides giv ng 

 the definitions of the terms, much va uable information is added 

 in many cases. The work is an cfxcellent one ; it is very complete, 

 and is just what is needed." — American Machinist. 



" The broad field of elec. ricai engineering is well covered ))y this 

 book, and its reasonable price should insure it a large sale." 

 ^Electrical Age. 

 Electrical Engineers' and Students' Chart and Handbook 



of the Brush Arc Light System. 



By H. C. Reagan, Jr. With Pocket Chart. N. Y., 1895. 



Illustrated, 8vo, cloth, §1.00. 

 The Modern Machinist. 



By John T. Usher. Illustrated by 257 engravings. 322 



pages, 12mo, cloth, §2.50. 

 A Practical Treatise on Modern Machine Shop Methods. De- 

 scribing in a comprehensive manner the most approve 1 methods, 

 processes and appliances employed in present machine shop 

 practice. 

 Shop Kinks. By Robert Grimshaw. 250 illustrations. 400 



pages, 8vo, $2.50, 

 This book is entirely different from any other on machine-shop 

 practice. It is not descriptive of universal or common shop 

 usage, but shows special ways of doing things better, morecheaplj' 

 or niore rapidly than usual, as done in fifty or more leading shops 

 in Europe and America. 



A special illustrated circular of any of the above sent free on 

 application. 



Our Book Catalogues, embracing rvorks on every prac- 

 tical subject, mailed free. 



*** Copies of any of the above sent prepaid, on receipt of price. 



Norman W. Henley k Co., ''LTToni:- 



SOME RECENT PUBLrCATIONS 



BY 



JOHN WILEY & SONS, 



53 East 10th St., New York. 



A Text=Book on the Mechanics of Materials 



By Peof. Mansfield Meeeimak. Sixth Edition, 

 revised and enlarged. 8vo, cloth, |4.00. 



Mechanical Engineer's Pocket=Book. By Wil- 

 liam Kent, M.E. 12mo, morocco, 1100 pages,S5.00. 



A Treatise on Civil Engineering. By W. M 

 Patton, C.E. 8vo, cloth, §7.50. 



A Hand-Book for Surveyors. By Peof. Mans- 

 FIELD Meeeiman and John P. Beooks. 12mo, 

 morocco flap, §2.00. 



Minerals, and How to Study Them. A Text- 

 Book for Beginnei-s in Mineralogy. By Peof. Ed- 

 waed S. Dana. 12mo, §1.50. 



Architectural Engineering. With special ref- 

 erence to High Building Construction. By Joseph 

 K. Feeitag. 8vo, cloth, 12.50. 



Heating and Ventilating of Buildings. An Ele- 

 mentary Treatise. By Peof. Eolla C. Caepentee. 

 Svo, cloth, §3.00. 



A Treatise on Hydraulics. By Pkof. Heney 

 T. Bovey, Montreal. Svo, cloth, |4.00. 



Descriptive Geometry. By Pkof. C. W. Mac- 

 Coed. Svo, cloth, §3.00. 



The Filtration of Public Water Supplies. By 

 Allen Hazen. Svo, cloth, §2.00. 



The Elementary Principles of Mechanics. By 

 A. Jay Du Bois. Three volumes, Svo, cloth. Vol. 

 I. Kinematics, §3.50. Vol. II. Statics, |4.00. Vol. 

 III. Kinetics, §3.50. 



Lecture Notes on Theoretical Chemistry. By 

 De. F. G. Weiohmann. Second Edition, enlarged. 

 12mo, cloth, §3.00. 



Problems in the Use and Adjustment of En= 

 gineerjng Instruments. By W. L. Webb. 16mo, 

 morocco, §1.00. 



A ilanual of Lithology. Treating of the Prin- 

 ciples of the Science, with special reference to Mega- 

 scopic Analysis. By Peof. E. H. Williams. Second 

 Edition, entirely rewritten. Svo, cloth, §3.00. 



Compressed Air. By Frank Eichaeds. 12mo, 

 cloth, §1.50. 



Rope Driving. A Treatise on the Transmission 

 of Power by means of Fibrous Eopes. By Peof. J. 

 J. Flathee, Purdue University. Nearly 100 figures. 

 ]2mo, cloth, §2.00. 



Screw Propellers and Marine Propulsion. By 

 I. McKiM Chase, M.E. 31 full-page plates. Svo, 

 cloth, §3.00. 



Roads and Pavements in France. By Alfeed 

 P. EocKWELL, A.M., Ph.B. 12mo, cloth, §1.25. 



Cyanide Processes for Qold and Silver Ores. 

 By E. B. Wilson, E.M. 12mo, cloth, §1.50. 



Descriptive Circulars Mailed on Application. 



