Allen, Paul W. Industrial fermentations. New York: Chemical Catalog Company, Inc., 1926. 424 p. illus. 8°. $5.00.

VOD (119)

Discusses the role of the microorganism in the following industries: Industrial alcohol, leather and tanning, retting of hemp and flax, legume culture, disinfectants, wood preservation, textiles, tobacco, silage, organic acid production, acetone, glycerin, sewage disposal, soy-bean sauce, bread-making, corn products, food preservation, canning, cane and beet sugar, meat products, marine products, vinegar, yeast, tomato products, fruit juices and beverages, coffee and cocoa, drinking water, egg industry, maple sugar and maple syrup, dairy products, and the cultivation of the soil. Reviews history and uses of each product, and describes processes of manufacture and microbiology involved. Bibliographies at chapter endings. Author is Professor of Bacteriology in the University of Tennessee.

American Petroleum Institute. American petroleum supply and demand. A report to the Board of Directors by a committee of eleven members of the Board. New York: McGraw-Hill Book Company, Inc., 1925. xiii, 269 p. 8°. $3.00. VHY (117)

Careful estimates by experts of our oil resources from wells, shale, coal, and lignite; also of the probable demands for the next fifty years. Prospecting and recovery methods are described and there are statistics and tables.

Reviewed in Motorship, Sept., 1925; Oil age, Sept., 1925; Engineering news-record, Aug. 20, 1925; Natural gas, Sept., 1925.

American Water Works Association. Water works practice. A manual. Baltimore: The Williams & Wilkins Company, 1925. xx, 790 p. diagrs. 8°. $5.00.

VDL (121)

"The achievement is one that has seldom been equalled by a technical society. After a general introduction which includes a historical summary with statistics on water works growth, the book falls into seven main divisions.

These take up collection of water, quality, treatment, distribution, the financing and management of water-works, and fire protection. The appendix gives a number of standard forms, methods of procedure, specifications, etc." Engineering news-record, Oct. 15, 1925.

Amos, Percy A. Processes of flour manufacture. New edition revised by James Grant. London and New York: Longmans, Green and Company, 1925. xii, 310 p. illus. 12°. $3.00. VTG

* Badger, W. L. Heat transfer and evaporation. New York: Chemical Catalog Company, 1926. 306 p. illus. 8°. $5.00. VOF (119)

For the initiated and involves a liberal use of mathematics. The first few chapters deal with heat transfer in general; the rest of the work with the theory and practice of evaporators in detail. Much of historical interest and numerous citations to patents. Chapter 13 treats briefly of evaporators applied in specific industries, while chapter 14 deals with costs. Excellent illustrations. Author is Professor of Chemical Engineering at the University of Michigan.

as

*Bardorf, C. F., and J. A. B. BALL. The elements of sugar refining. Easton, Penn.: Chemical Publishing Co., 1925. x, 240 p. illus. 8°. $4.00. VTL

"Covers the details of American practice in dealing with sugar from the raw material to the marketable article. The several processes are described fully, and, where appropriate, illustrations are given... The apparatus used for assaying the raw material and determining are given... Much attention is given as to general testing procedures... The more important accounting problems are treated clearly." Henry Leffmann in Journal of the Franklin Institute, Oct., 1925.

Blake, Ernest G. Roof coverings, their manufacture and application...with 144 illustrations. London: Chapman and Hall, 1925. 264 p. 8°. 10s. 6d. VEK (121)

"The origin and nature of the materials, and the processes by which they are converted into a suitable condition for their specific purpose, are given, and the methods that are usually adopted in fixing them on the roof are clearly explained, so that a little knowledge of the subject, combined with a fair amount of ordinary intelligence, should be sufficient to enable one to obtain a reasonable grasp of the subject, and to judge as to the most suitable steps to be taken for any particular building. In most cases the present cost [British] of the articles is given." — Preface. Reviewed in Surveyor, July 17, 1925.

*Bleich, Friedrich. Theorie und Berechnung der eisernen Brücken. Berlin: Julius Springer, 1924. xi, 581 p. illus. 4°. $9.00. VEK (121)

Theory and mathematics of iron bridges set forth in detail. Also deals with the local stresses of structural parts, and of riveting and bolting; bridge floors; wind and cross bracing; and bridge bearings and joints.

"His references to experiments on the distribution of pressure over plates of varying sizes are hardly While drawing attention to recent comup to date. parative experiments on finished railway bridges and laboratory researches, conducted chiefly in Switzerland, Germany and America, he does not fail to point out the need for further elucidation of many problems by experimental work. He does not illustrate any finished bridge, nor does he appear particularly to refer to famous bridge failures. He makes numerous

Characteristics of various wheats discussed and the manufacturing processes described with considerable detail and good illustrations. The new edition has additional examination papers, a bibliography, and a new chapter on general principles and the chemistry of the wheat berry.

quotations from the detailed legal regulations as to the strength of parts in force in Austria, Sweden, Switzerland, etc., and works out examples of calculations. Dr. Bleich has discharged his task in an original, very able and comprehensive manner." Engineering, May 15, 1925.

*Boettger, Wilhelm. Qualitative Analyse und ihre wissenschaftliche Begründung. Vierte bis siebente umgearbeitete und erweiterte Auflage. Leipzig: Wilhelm Engelmann, 1925. xi, 644 p. illus. tables in pocket. 8°. 19 gold marks. PMF (119)

"The new edition is a very worthy successor to the old [1913] and gives a good idea of the advances that have been made in the interval. The first and more difficult part, dealing with the theoretical foundations, is particularly well done; the language is clear and simple, and the experimental illustrations are well chosen. Modern views on valency and molecular structure are treated at length, and there is an interesting section on electrolytes and Werner's theory... Books of this type are very few in these days of costly printing."Nature, Sept. 12, 1925.

Also reviewed in American journal of science, June, 1925.

Booth, W. H., and J. B. C. KERSHAW. Fuel economy and smoke prevention. London: Constable and Company, Ltd., 1925. xiii, 268 p. illus. 8°. 16s. VHV (117)

"

The first edition appeared in 1904, the second in 1911, both under the title, "Smoke prevention and fuel economy. The new edition, which is practically a new book, is by Mr. Kershaw. Deals with the constitution, preparation, selection, and storage of coal; chemistry of combustion; present-day methods of burning fuel; combustion of pulverized, liquid, and gaseous fuels; combustion control; bonus and other systems; waste steam and waste heat; the legal position and the work of voluntary agencies for promoting smoke abatement; boilers and furnaces in recently erected large power stations. 91 illustrations.

Reviewed in Mechanical world, Sept. 4, 1925; Gas and oil power, Oct. 1, 1925; Electrical review, London, Oct. 16, 1925; Electricity, Aug. 14, 1925.

*Bryant, John Myron, and J. A. CORRELL. Alternating current circuits. New York: McGraw-Hill Book Company, Inc., 1925. xii, 412 p. diagrs. 8°. $4.00. VGM (121)

Deals with theory and its application to polyphase circuits and transmission lines. Requires a knowledge of college physics, the calculus, and vector analysis. Authors are professors in the University of Texas.

"A large number of illustrative problems aid in clarifying the text and fixing the principles. This new text is sure to be considered favorably by many teachers.' Electrical world, Dec. 12, 1925.

*Bunbury, H. M., and A. DAVIDSON. The industrial applications of coal tar products. London: Ernest Benn, Ltd., 1925. xi, 284 p. 4°. 42s. VOF (119)

"If its inclination is towards the theoretical and highly technical phases, it is what may be expected, but nevertheless the language is simple and the reading easy, and the profusion of formulae is not so terrifying as appears at first sight... The work describes the preparation of each of these derivatives, tabulates their uses and potential uses. suggests alternative and more efficient processes and generally makes known their full possibilities, providing a standard work of reference to the tar distiller and chemist and an authoritative text-book for students of chemical technology."- · Colliery guardian, Nov. 20, 1925.

Also reviewed in Iron and coal trades review, Oct. 30, 1925.

Caldwell, Otis W., and W. H. D. MEIER. Open doors to science. Boston: Ginn and Company, 1925. x, 333 p. illus. 12°. $1.00. OAP (117)

Inquisitive children (and adults too) will find many facts of daily observation, especially those concerning the equipment and running of the home, explained simply and with numerous illustrations and interesting questions. Authors are teachers in Teachers' College, New York, and the State Normal School, Framingham, Massachusetts, respectively.

Reviewed in General science quarterly, Nov., 1925.

*Case, John. The strength of materials. London and New York: Longmans, Green and Company, 1925. viii, 558 p. illus. 8°. $10.00. VEE (121)

Although intended for advanced students possessing a knowledge of the calculus, considerable attention is given to elementary conceptions. Includes some of the more unusual types of stress problems arising in the drawing office. Omits experimental parts of the subject as well as the metallurgical aspects. Excellent text and reference work. Author is Lecturer in Applied Mechanics at the Royal Naval Engineering College, Keyham, England.

Reviewed in World power, Nov., 1925; Marine engineer and motorship builder, Nov., 1925.

Collins, Mary. Colour-blindness, with a comparison of different methods of testing colour-blindness, with an introduction by Dr. James Drever. London: Kegan Paul, Trench, Trubner and Co., Ltd.; New York: Harcourt, Brace and Co., Inc., 1925. xxxi, 237 p. illus. 8°. 12s. 6d. PEY (117)

Author is Lecturer on Applied Psychology, University of Edinburgh. Tests were made upon ten students of that institution.

Reviewed in Nature, Oct. 3, 1925.

*Courant, RICHARD, and David Hilbert, Methoden der mathematischen Physik. Bd. 1. Berlin: Julius Springer, 1924. xiii, 450 p. diagrs. 8°. (Die Grundlehren der mathematischen Wissenschaften. Bd. 12.) paper, 22.50 mks.; bound 24 mks. PAE (117)

"Centers around one single problem, the oscillation problem, with its mathematical equivalents, the boundary value and expansion problems... In spite of its restricted scope, is rich in material and in points of view which are either novel or little known." Einar Hille in Bulletin of the American Mathematical Society, Oct., 1925.

Croft, Terrell. Electrical-machinery erection. New York: McGraw-Hill Book Company, Inc., 1925. ix, 314 p. illus. 8°. $3.00. VGI (121)

Detailed instructions, with a large number of informative illustrations, on unloading and moving, supporting, erecting, locating, fixing and mechanical maintenance.

"A great many useful facts and some valuable data dealing with a phase of engineering practice which, despite its importance, has not received the attention it deserves. Electrical review, London, Sept. 25, 1925.

computing compound interest, ordinary and special annuities, interest, bond valuation, depletion and other computations. Each point made is illustrated by one or more actual examples expressed in arithmetic or in the simplest elementary algebra." Manufacturers record, Sept. 17, 1925.

Davis, Charles G. Ship models; how to build them. Salem, Massachusetts: Marine Research Society, 1925. xii, 139 p. illus. 8°. $5.20. VXH (121) Detailed directions with the author's drawings, including two folding plans of a clipper ship.

"Mr. Davis has had an unusual training. A naval architect by profession he has built many types of vessels and during the World War he superintended the_construction of a score or more of large ships." - Preface.

Reviewed in Modelmaker, Dec., 1925.

Drover, F. J. Marine engineering repairs, including adjustments and maintenance. London: Chapman and Hall, 1925. 235 p. 8°. 9s. 6d. VXHG (121)

Author is a captain in the British Navy. A complete handbook of maintenance and repair including turbine and steam reciprocating engines, auxiliary and boat's machinery, boilers, hull and underwater fittings, with a chapter on docking and undocking.

Reviewed in Marine engineer and motorship builder, July, 1925; Shipbuilding and shipping record, Aug. 13, 1925; Marine engineering and shipping age, Aug., 1925.

*Duff, A. Wilmer. College physics. London and New York: Longmans, Green and Company, 1925. xii, 484 p. illus. 8°. $3.80. PAF (117)

"Intended as a text-book for a beginning course, of which demonstration lectures form a part. The book is therefore concise, and does not contain a great deal of purely illustrative material or technical applications. The topics treated...are clearly presented and the phenomena described are intimately connected with the principles to be illustrated." J. R. Collins in Physical review, Sept., 1925.

Author is Professor of Physics in Worcester Polytechnic Institute.

Dunell, H. British wire-drawing and wire-working machinery, with a foreword by Sir W. Peter Rylands. London: Constable and Company, Ltd., 1925. xv, 188 p. illus. 4°. 21s. VND (121)

"This work, based on a series of articles which appeared in The Engineer, gives an interesting review of the whole subject of wire manufacture, and contains an account of some little-known processes for the manufacture of wire articles. The first seven chapters deal with the production of wire from the raw material, the remainder of the work describing the manufacture of such articles as wire netting, barbed wire, nails, pins, needles, safety pins, and wire chains. A good account of modern machinery for cable making is given in Chapter XI. The gen eral treatment is descriptive, and the work is well illustrated." World power, Nov., 1925.

Also reviewed in Electricity, Sept. 18, 1925; Mechanical world, Oct. 30, 1925; Metal industry, London, Nov. 20, 1925.

*Eagle, Albert. A practical treatise on Fourier's theorem and harmonic analysis for physicists and engineers. London and New York: Longmans, Green & Company, 1925. xiv, 178 p. diagrs. 8°. $2.75.

OIH (117) Presupposing elementary knowledge of trigonometry and of calculus on the part of the reader, an attempt is made "to give a fairly complete account of the practical methods of analysing any given curve

or

set of observations into its harmonic constituents, if it be a periodic function, and of detecting any periodic component in it if it is not a periodic function." Preface.

Reviewed in Electricity, Oct. 16, 1925.

* Eardley-Wilmot, V. L. Molybdenum. Metallurgy and uses and the occurrence, mining and concentration of its ores. Ottawa: Government Printing Office, 1925. xii, 292 p. illus., fold. maps in pocket. 8°. VHCA (117)

Although confined principally to Canada there is much concerning the metal in other parts of the world. Has an extensive bibliography.

* Egli, Karl. Die Unfälle beim chemischen Arbeiten, stark vermehrt und umgearbeitet von Dr. Ernst Rüst. Leipzig: Rascher & Cie., 1925. vii, 261 p. 8°. 8 mks. VOD (119)

Enlargement of 1902-1903. work published in Treats of accidents in chemical plants and laboratories, covering mechanical injuries, burns and cauteries, poisonings, and explosions, with instances of actual occurrence. Includes an alphabetical list of dangerous chemicals and precautions to be observed in their use. Extensive bibliography.

"The book should appeal not only to the technologist but also to the medical man and to all those whose work brings them into contact with chemicals, whether in their manufacture, storage, transport or use." J. H. Shores in Chemistry and industry, Aug. 21, 1926.

Ellis, Carleton, and A. A. WELLS. The chemical action of ultraviolet rays. New York: Chemical Catalog Company, Inc., 1925. 362 p. illus. 8°. $5.00. PLC (119)

Complete survey of the periodical and patent records of the subject. Covers the nature and sources of the light, the various kinds of lamps, protective glasses and filters, reactions of gases, photo-chemical and photolytic reactions, effect on halogenation reactions, photosynthesis, sterilization, biologic effects and therapeutic applications, and miscellaneous applications.

*Escard, Jean. Les fours électriques industriels et les fabrications électrothermiques... Paris: Dunod, 1924. viii, 674 p. 2. ed. illus. 8°. 80 fr. VIG (117)

Up-to-date, including researches of this eminent author. Deals with the various types of apparatus and their installation, the manufacture and selection of electrodes, the extraction of metals, the electrometallurgy of zinc, of aluminium, of steel, of alloys, and of carborundum; the production of synthetic nitrogen, fused quartz, and various other substances. Amply illustrated with line drawings of apparatus and with photomicrographs.

* Fisher, R. A. Statistical methods for research workers. Edinburgh: Oliver and Boyd, 1925. ix, 239 p. diagrs., tables. 8°. 15s. OFX (117)

"To put into the hands of research workers, and especially of biologists, the means of applying statistical tests accurately to numerical data accumulated in their own laboratories or available in the literature. Such tests are the result of solutions of problems of distribution, most of which are but recent additions to our knowledge and have so far only appeared in specialized mathematical papers.' Introduction.

*Gilbert, Albert T. Gas meters, their construction, use, fixing, inspection, and maintenance. A handbook for engineers and managers, inspectors, fitters and students.