AM37_349 - B OOK R EVIEWS P HOTOGRAPHS, b v N . M . F . THE...

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BOOK REVIEWS THE INTERPRETATION OF X-RAY DIFFRACTION PHOTOGRAPHS, bv N. M. F. HrNnY, H. Lrrson arvl W. A. Woosrnn, MacMillan and Co., London, 1951, ix*258 pages, price 42 shillings. (American price $8.50, obtained from D. Van Nostrand Co., Inc., New York, N. Y.) This book is intended "to help students and research workers to understand the theory and practice of the interpretation of r-ray difiraction photographs'" The discussion is carried up to the subject of crystal-structure determination but does not include more than passing reference to space groups and their recognition by means of *-ray diffraction. Had a chapter on space groups been included, and it would have required no more space than that devoted to Laue photographs in the present volume, all materials needed pre- paratory to crystal structure work would have been brought together. The omission is the more regrettable because the authors state that "a sufficient number of tables has been included to facilitate calculations without the necessity of a reference book." Many who do not embark upon crystal structure work do attempt the determination of space groups and a statement of the space group, now considered part of a complete mineral description, is to be found in several recently published mineralogical reference books. What seems to this reviewer the pedagogical excellence of Henry, Lipson and Wooster's book is probably due in part to the fact that the authors have been associated with the very thorough course in crystallography which has been ofiered at the University of Cambridge for many years. The book has many fine features. It is clearly written and very well illustrated. There are diagrams on almost every page and many points are iiluminated by detailed discussion of examples. The reciprocal lattice is used extensively. "Much material is presented in a geometrical way, as it has been found that this is the most suitable method of teaching crystallography." A few problems for students are included and carefully worded answers are given in an appendix. A pleasing and novel feature is the reference list which has been arranged to serve as a name index. An appropriate statement about the relation between kX and A units is made in chapter 2. Nevertheless kX units are called A units in the first ten chapters, while A units proper are used in chapters 11 to 17. It is to be feared that this will perpetuate the existing confusion as few will read or remember the authors'note explaining the curious manner in which they have dealt with this problem. The emphasis is obviously determined by British conditions and especially by the ex- perience of the authors. This will restrict the usefulness of the book in the United States. Charts for the interpretation of single crystal patterns are based on a camera radius of 3 cm. By photographic reduction they may be adapted to the 57.3 mm. diameter commonly used. The scant space given to important modern techniques widely used in this country is a lack not so easily overcome. The precession method is barely mentioned and the equi-
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This note was uploaded on 10/26/2010 for the course GEOLOGY 101 taught by Professor Sad during the Spring '10 term at AUL.

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AM37_349 - B OOK R EVIEWS P HOTOGRAPHS, b v N . M . F . THE...

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