26 



SCIENCE. 



[Vol. XVI. No. 



■"oyclograph" will undoubtedly do much service hereafter. An 

 analysis of the motions of the machine as it passes over obstruc- 

 tions is also likely to prove of value in the promotion of safety, 

 and in the elimination of the "header" from the list of casualties. 

 - A chapter on ball-bearings includes a discussion of the subject 

 by Professor S. W. Robinson, which is a valuable contribution, 

 especially as giving the limit of weight allowable for balls of any 

 given size. The co-efficient of friction for a one inch ball is given 

 as about 0.00175, as derived from experiments upon the Lick tele- 

 scope. The book is full of interesting information for the wheel- 

 man, and abounds in good reading for all those who are interested 

 in the subject. 



Steam. By William Ripper. London and New York, Long- 

 mans, Green, & Co. 12°. 



This is a little primer of steam and the steam-engine. It is a 

 reproduction of notes of lectures addressed by its author to an 

 evening class of young "mechanical engineers"' (the term is evi- 

 dently not applied to the class usually considered to be represented 

 by it in this country), and includes a course of discussions of 

 steam-engines, boilers, and accessory subjects. 



Within these two hundred pages are compressed the best com- 

 pendium of the subject that has yet been published. It is also, 

 so far as we have been able to discover, accurate, and is evidently 

 written by an engineer familiar with the science and the art, and 

 not, as is too often the case where these primers are produced, 

 by an amateur or tyro hardly more familiar with the subject than 

 those to wliom his instruction is offered. A preliminary discus- 

 sion of the physical properties of steam, the chemical principles of 

 combustion, and the elements of thermodynamics, is followed by 

 a brief description of the modern steam-engine, its construction, 

 and its performance, which is really of value, and might well re- 

 pay the professional for the time required to read it. The book is 

 well illustrated, in the sense of having a good list of engravings, 

 though their quality as specimens of the engraver's art may not 

 be reckoned high, in the opinioa of the expert. The compound 



engine is described, and its principles summarized, and the book 

 is concluded by a chapter on the management of engines and 

 boilers. 



AMONG THE PUBLISHERS. 



We have received No. 30 of "Odds and Ends from the Lit- 

 erary Junk Shop," by A. S. Clark of 34 Park Row, this city. 



— "Education as a Factor in Civilization" is the title of an essay 

 by Caroline B. LeRow in the Modern Science Essayist for June 

 15. In the issue of July 1 John W. Chadwick treats of "Evolu- 

 tion and Social Reform," dealing mainly with "The Theological 

 Method ." 



— Painters — and by this we mean artists, and not carriage or 

 house painters — are not, as a class, persons likely to lake interest 

 in the chemistry of paints and painting. Yet it appears that the 

 Royal Academy of Arts in London has a professor of chemistry 

 in the person of A. M. Church, a mister of arts, and fellow of the 

 Royal Society; and this same Professor Church has written a 

 "Chemistry of Paints and Painting," which is published in New 

 York by Macmillan. The book is intended for those who use 

 paints, and is meant as a help, that paints and varnishes may 

 be well chosen and properly used. It is not expected that any 

 one will read the book through, but that information will be 

 sought within its covers as occasion may occur. It has therefore 

 happened that to some extent the same matter has been inserted 

 under more than one headmg in the book. The book is unique in 

 its field, and should be available to all likely to be interested. 



— Mr. Arthur H. Noll has written " .V Short History of Mexico," 

 which has been published by A. C. McClurg & Co. of Chicago. 

 The author states in his preface that he has been unable to find 

 any comprehensive history of Mexico in the English language, 

 and he "has accordingly endeavored to make up the deficiency. 

 We wish we could say that he has succeeded; but in fact his 

 work is extremely unsatisfactory. He has no intelligent concep- 



iacniillaii (Ill's lew Boots. 



Now Ready. Vol. III. completing the ivork. 



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