# The Interpretation of X-ray Diffraction Photographs by N. F. M. Henry, H. Lipson and W. A. Wooster

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- International Union of Crystallography
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## Abstract

a28404.pdf 576 BOOK REVIEWS intensities. Thus the overall computational accuracy of 5~o, which the author recommends, will be required for very precise determinations only. In the main part of the book the author discusses the different ' methods for computing one-, two- and three- dimensional syntheses by direct calculation or by Hollerith machines, and other mechanical, electrical and optical devices. This part contains many interesting ideas and may give valuable suggestions to those who are con- cerned with the development of new equipment for Fourier synthesis, and, indeed, for everybody who has repeatedly to carry out such calculations. The second volume consists of tables of the function cos 27rhx cos 21rky in steps of ~8 for x and y between 0 and ½. The reviewer regrets to say that this table is only of very limited use. In many cases a step difference of 1 is not sufficient; an efficient use of the table can be u4 made only ff 2'a~ = Fa~; and, finally, the usual method of splitting the two-dimensional synthesis into one-dimen- sional series works faster. (In a special case (with Fa~---Fa~ ) 99 multiplications and additions had to be carried out using the usual method but 144 using the table.) The table will, however, be found convenient for calculating the density at a few points of a projection or for checking a machine calculation at a few spots. R. BRrLL. Polytechnic Institute of Brooklyn Brooklyn 2, N.Y. , U.S.A. Krysta l lometr i sches P rakt ikum. Grundbegr i f fe undUntersuchungsmethoden. ByR. SCHROV, D~R. Pp. v i i i+199 with 156 figs. Berlin; GS~tingen; Heidelberg" Springer. 1950. Price DM. 15.60. This book is intended as an introduction to crystal geometry and morphology, and in particular to the geometrical methods and notation of V. Goldschmidt, which the author considers to be of outstanding useful- ness. The first half of the book deals with general principles. The approach is not meant to be rigidly theoretical but t

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