288 



SCIENCE 



[N. S. Vol. XXXIX. No. 999 



Elementary Machine Design. By William 0. 



Marshall, Assistant Professor of Machine 



Design in Sheffield Scientific School of Tale 



University. 



This book is prepared for the use of students 

 who have not studied mechanics or mechanism. 

 It is in reality a book of information and 

 instructions for a course in drawing various 

 machine details. The course as outlined 

 would give a student familarity with many 

 of the details of machine construction and 

 considerable practise in drawing them. No 

 attempt is made, however, to give training 

 which would enable the student to look at a 

 problem in machine design in a broad way 

 and to attack it understandingly. It seems 

 fair then to call it a book of information 

 rather than a text-book either of machine 

 design or machine drawing. It would be a 

 valuable handbook for a draftsman who is 

 already familiar with the principles and 

 methods of machine design. 



The first chapter consists of a discussion of 

 machine drawing, general in some respects 

 and minute in others. The other chapters 

 treat of rivets and riveted joints, piping, 

 screws and bolts, shafting and shaft couplings, 

 stuffing boxes, bearings, journals, hangers, 

 pistons and piston rods, connecting rods, pul- 

 leys, belting, gearing, valves. Under the head 

 of "Useful Information" are a number of 

 convenient tables, and similar tables are scat- 

 tered through the book. 



W. H. James 



Grundriss der Kristallographie. By Dr. 



GoTTLOB LiNCK. Third Revised Edition. 



Jena, Verlag von Gustav Fischer. Pp. 



viii4-2Y2. Figs. 631. Colored Plates, 3. 



Price 11.50 Marks. 



The appearance of a third edition of this 

 excellent text-book of crystallography only five 

 years after the publication of the second edi- 

 tion is an indication that its author has suc- 

 ceeded in treating what is usually regarded as 

 a dry subject in a way that has attracted 

 many readers. A part of the popularity of the 

 volume is due no doubt to the fact that crys- 

 tallography is being studied abroad more and 



more thorougUy by chemists and physicists 

 since the spread of interest in physical chem- 

 istry. Unfortunately, in America the science 

 has few followers, but in Germany and Eng- 

 land it appears to be enjoying a renaissance. 

 Crystallography no longer deals merely with 

 the description of crystal forms and the cal- 

 culation of crystal constants. In its modern 

 phase it is more directly concerned with the 

 relations that exist between the forms and 

 properties of substances and the proper ex- 

 planation of these relations. Crystallography 

 is rapidly becoming a branch of physical 

 chemistry. It is because the author has real- 

 ized this tendency in the science and has 

 given us a book that deals so fully with the 

 fundamental conceptions of physical and 

 chemical crystallography that his volume has 

 been received with such universal favor. 



Of the new edition, 96 pages are devoted to 

 the discussion of crystal forms and the balance 

 to the discussion of the physical and chemical 

 properties of crystals. There is no difference 

 in method of treatment in the second and 

 third editions. There are 27 more figures and 

 18 more pages in the new edition, but these 

 additions are simply expansions of a few of the 

 topics treated in the earlier edition. The addi- 

 tional figures were introduced mainly to em- 

 phasize some of the statements concerning the 

 mechanical and optical properties of crystals, 

 and the additional pages are the result of a 

 little more detailed discussion of their optical 

 properties. Throughout the book, where 

 necessary, the text has been changed to bring 

 it up to date and a few paragraphs have been, 

 introduced to call attention to some of the 

 recent new work on crystals. The new figures 

 are all of the same high grade of excellency 

 as those characterizing the second edition. 



The new edition is unquestionably the hand- 

 somest, best proportioned, most concise and at 

 the same time most comprehensive elementary 

 text-book on crystallography in any language. 

 It is readable because logical, and it is modem. 

 Moreover, it is not burdened by the involved 

 sentences and the otherwise atrocious style 

 that characterize so many German science 

 text-books. W. S. Bayley 



