RECENT BOOKS [GUIDESTO SOUND FILMS.] 1. ENERGY AND ITSTRANSPOWA- should he of this character. The present reviewer differs someTION. 2. ELECTROSTATICS. Hermann I.Scklesingw and Har- what with this view, holding rather to the opinion that the meucy B. Lemon, University of Chicago. University of Chicago chanical. civil, or electrical engineering student, a t least, will Press, Chicago, 1933. 1. iv 25 pp. 2. iv 26 pp. 8 and profit to a higher degree from a course which is chiefly concerned with modern aspects of physical metallurgy. Many other 9 figs., respectively. 14 X 20 cm. 35 cents each. college teachers believe otherwise, and, in any event, it must be ENERGY AND ITS TRANSFORMATIONS admitted that the present text is written in an extremely clear The booklet is a study guide t o aid the teacher in preparing manner and that it is, for the most part. well balanced. The senior author is responsible for Part I, on Materials Conthe class for the picture, t o make clear the objectives of the unit treated and give additional references and other materials con- sumed in Metallurgy (48 pp.), dealing with ores, slags and sidered useful in sssisting in the interpretation of the subject fluxes, refractories and furnace linings, fuels and their use, matter of the picture. A list of eight specific objectives is fol- and air and water supply. The junior author has written lowed by a three-page presentation of material fundamental to Part 111 (233 pp.), covering the metallic state, alloys, properthat of the film. A topical outline of study materials is followed ties as related to structure, technology of shaping metals, other by suggestions ss to how the film may be used most effectively. physico-metallurgical processes, and slags, bullion, matte and speiss. Part I1 (206 pp.), is collaborative and contains chapters Numerous notes a t various points in the study outline and nearly on ore preparation for extraction processes, hydrometallurgical two pages of references a t the end are given to aid the teacher apparatus and processes, electrometallurgy and electrometallurgiin selecting additional study materials. This study outline has been very carefully prepared. It is cal apparatus, sampling, dust and fume control, and measureconcise, clear, and scientifically accurate a t every point, as far ment of temperatures (Liddell), and on pyrometallurgical processes and briquetting (Daan). as the writer is capable of judging. A wide field of subject One might wish that the discussion of slags and fluxes had been matter has been covered and yet the continuity has not been lost nor interest sacrificed. This outline will be absolutely re- illustrated by one or two equilibrium diagrams, merely to illus-. since an extended disquired if proper use of the film is to be achieved, and teachers trate the neneral method of reasoninz. of the physical sciences everywhere will find i t a valuable aid cussian of slag systems from thi5 standpoint would bc out of in the presentation of the unit "Energy," whether the film he place in a trcatice of this scope. Fortunately, thc general principlcs are even notice in the last chapter. which dcds with slags. used with it or not. matte, bullion, and speiss. ELECTROSTATICS I t might likewise seem that as important a subject as that of This booklet is a study guide to aid teachers in preparing the flotation deserves more than its approximate one and one-half .. class for the accompanying picture, and to use the picture most pages. effectively. A list of ten specific objectives of the study of the The portion dealing with physical metallurgy is exceptionally unit "Electrostatics" is followed by three pages of material con- good. The discussions are clear and they are illustrated by sidered fundamental to the unit. A short topical outline of study many drawings and photographs which should materially assist materials and specific directions covering the use of the film is the student in his attempt t o grasp modern conceptions as to the followed by fifteen pages covering the subject matter of the film. physics of metallurgy. Throughout the booklet footnotes serve t o supplement and make Whether this book be used as a class text or placed in thelibrary more clear statements necessarily short and terse in the film as a reference book, it will be af assistance to both teacher and itself. Two pages of general references are given to aid the student. teacher in selecting additional study materials. This bwklet, like all the rest of the series, has been very carefully prepared. The authors have been able to go directly to the essentials of the unit and to present them clearly and accurately. A large field of subject matter is covered, yet a definite PRACTICAL CHEMISTRY.(For Intermediate Science Students.) continuity has been kept and a cleir-cut, definite stomis told. N . M . Shah, M.Sc., Karnatak College. The Students' Own The language used is better adapted t o t* college than t o the Book Depot, Dharwar, India. Second edition, 1933. ix high school, but it is never involved nor too technical as is often 93; iii 63 pp. and appendices. 32 Figs. 14 X 21.5 cm. the case in a paper of this kind. Rs. 1/8. This booklet is absolutely essential to the e5ective use of the The laboratory manual is designed for students preparing for film and of great value to teachers of physical science everywhere the intermediate science examinations in the Indian universities. J. 0 . FRANK I t includes a few experiments in general inorganic chemistry, STAT=TBACRBRS' COLLBOQ but much meater soace is devotetl to analvtical orocedures-both osrrxosa, WISCONSIN qualitative and quantitative. This emphasis makes the book PRINCIPLES OR METALLURGY.Donald M. Liddell, Engineer and unsuited to the conventional cunrscs in .imerican universities. Economist, arid Gilbert E. Doan, Associate Professor of Physil'hc illustration^ of apparatus and technics are unusually well cal Metallurgy, Lehigh University. McGraw-Hill Book Co., conceived, the print is excellent, and there are but few typoInc., New Yark City, 1933. vi 626 pp. 301 Figs. 15 X graphical errors, although incongruity is introduced by the use 22.5 cm. 55.50. of English units of length and metric units of volume. According to the commonly accepted meaning of the term, Scant attention is paid to Br, I, P, As, S, N, and C, except as this book is a text upon the subject of general metallurgy, since these elements are involved in analytical tests. On the other it is concerned almost entirely with principles, using specific hand. the student is eiven thorourh .. oooortnnitv to nurifv mateexamples only as illustrations of these principles. I n the pref- rials, to determine equivalent wci~hts,to identifp pure comace the authors state that they have attempted to make a book pounds and miattses, estimate thc solubilitiec of salts in wa1r.r. that will fulfil two functions: t o give the engineering student, and t o prepare salts by various methods. not specializing in metallurgy, a general view of the subject and The course is designed to be completed in a year's time with to give the metallurgical student a good foundation for his work three two-hour periods per week. It is apparent that these functions have been well fulfilled in R. A. BAKER this text-at least for those teachers who believe that the limited COLL&CB0. TAB course in metallurgy to he offered to non-specializing students CITY OR NBW YORK
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