SCIENCE-ADVERTISEMENTS 



NEWMcGRA W-HILL BOOKS-hsued in wis 



BLONDEL=JVlAILLOUX— Synchronous Motors and Converters 



By Andre A. Blondbl. Translated by C. O. Maillous, with additional chap- 

 ters by Prof. Comfort A. Adams, Harvard Univ. 300 pp. Illus. $3.00 

 (12/6) net, postpaid. Covers theory and methods of calculation and testing. 



HOBART— Design of Polyphase Generators and flotors 



By H. M. HoBAKT, Consulting Engineer, Gen. Elec. Co. 260 pp. Illus. 

 $3.00 (12/6) net, postpaid. Presents calculations and fundamental outlines. J 



GRAY— Electrical Hachine Design 



By Alexander Gray, Asst. Prof, of Elect. Eng., McGlll Univ. 528 pp. 

 Illus. $4.00 (17s) net, postpaid. Covers design and specification completely. 



PALMER— The Theory of fleasurements 



By A. DE Forest Palmer, Ph.D., Assoc. Prof, of Physics, Brown Univ. 

 248 pp. Illus. $2.50 (10/6) net, postpaid. A discussion of principles and 

 methods. 



NORTHRUP— Hethods of fleasuring Electrical Resistance 



By Edwin F. Northrup, Ph.D. 389 pp. Illus. $4.00 (17b) net, postpaid. 

 An authoritative treatise describing methods, simple measurements, details of 

 instruments, etc. 



THE INTERNATIONAL CHEHICAL SERIES 



HENRY P. TALBOT, Ph.D., Consulting Editor 



The first volumes in this series have had a gratifying reception. They have 

 been approved and adopted by several institutions. 



NORRIS— The Principles of Organic Chemistry 



By James F. Norris, Ph.D. Professor of Chemi.stry, Simmons College, Boston. 

 570 pp., 51x8. Illustrated. $2.50 (10/6) net, postpaid. 



CADY— Inorganic Chemistry 



By Hamilton Perkins Cadt, A.B., Ph.D. Professor of Chemistry, Univer- 

 sity of Kansas. 629 pp., 5Jx8. Illustrated. $2.50 (10/6) net, postpaid. 



STUDY OF MINERALS PETROGRAPHIC METHODS 



A Combined Text Book and Pocket Manual By E. WeiNSCHKNK, Trans, by RoBT. W. 



By Austin Flint Rogers, Ph.D., Assoc. Prof., Claek, Instructor in Petrography, Univ. of 



Leland Stanford Univ. 522 pp. 5x71. Flex- Michigan. 396 pp. 371 Illus. §3.50 (15s) net, 



ible leather. 13.50 (los) net, postpaid postpaid. 



ncGRAW=HILL BOOK CO 



239 West 39th St., New York 

 BERLIN LONDON 



