Sherman, H. C., and S. L. SMITH. The vitamins. New York: Chemical Catalog Co., Inc., 1922. iii, 273 p. illus. 8°. (American Chemical Society monograph series.) $4.00. PPB (118)

The term vitamins was introduced about ten years ago and although their chemical nature is unknown, much has been written concerning their effects upon animal organisms. This book, by two eminent food specialists, summarizes these results and endeavors to stimulate research in a quantitative rather than in a qualitative way. The work is brought through the year 1921. For the general reader the authors advise a preliminary reading of chapter 5, which covers the relation of vitamins to food supply. There is a bibliography of 26 pages.

*Soreau, Rodolphe.

Nomographie, ou Traite des abaques. Paris: Étienne Chiron, 1921. 2 v. 4°. 100 fr. OEI (117)

Unusually comprehensive and well-diagramed exposition of graphical methods for the solution of technical formulas and complicated equations. Illustrated with many practical examples. Hardly suited to the needs of the beginner.

*Svensen, Carl L. Machine drawing, a text and problem book for technical students and draftsmen. New York: D. Van Nostrand Co., 1921. viii, 214 p. illus. 8°. $2.25. VFE (121)

Designed for advanced students who have had instruction in mechanical drawing. A brief chapter on elementary principles introduces a full consideration of working drawings and drafting room practice with a chapter on the practice of dimensioning. Studies of the common machine details, empirical machine design, jigs and fixtures, etc., are included as properly belonging to an advanced course in machine drawing. Has 198 problems accompanied by 338 well executed drawings and layouts. Author is Assistant Professor of Engineering Drawing in Ohio State University.

Reviewed in Engineering world, Jan., 1922; American machinist, Jan. 5, 1922.

*Taggart, Arthur F. A manual of flotation processes. New York: John Wiley & Sons, Inc., 1921. xv, 181 p. illus. 8°. $3.00. VIB (117)

This book deals with the general methods of flotation, i. e. skin, oil, froth and differential; the labora tory equipment necessary for testing; the operation of testing; and the various commercial processes in use. Contains 56 figures and 16 tables.

"This small volume is well written, well edited, and well printed, and on the subjects which it covers we consider it easily the best book available to-day." -Engineering and mining journal, Jan. 28, 1921.

*Taylor, W. W. The chemistry of colloids and some technical applications. New York: Longmans, Green & Co., 1921. viii, 332 p. 2. ed. 8°. $3.50. PLD (118)

New edition contains a considerable amount of new material.

"The matter throughout is well chosen and lucidly described; the style is unusually bright and the gen eral handling of an undoubtedly difficult and involved subject is quite admirable.' Chemical age, London, Nov. 12, 1921.

Thirring, J. H. The ideas of Einstein's theory. The theory of relativity in simple language... Translated by Rhoda A. B. Russell. London: Methuen & Co., Ltd., 1921. xiv, 166 p. diagrs. 12°. 5s.

PAT (117) Treats of the special and general theories of relativity in a "popular" way without the use of mathe

matics. Author is Professor of Theoretical Physics in the University of Vienna.

Todd, Victor H. Protective relays, their theory, design, and practical operation. New York: McGraw-Hill Book Co., 1922. xii, 274 p. illus. 8°. $2.50. VGM (121)

This completely illustrated work tells how to protect generators, motors, transformers, and transmission lines from electrical disturbances and abnormal conditions, as well as to quickly sectionalize defective lines and units so that the service may continue uninterrupted. Designed not only for the operator or tester who has a fair knowledge of electricity, but for the designer of protective systems. Author is connected with The Westinghouse Electric & Manufacturing Company.

Reviewed in Power plant engineering, March 15, 1922; Journal of electricity and western industry, March 15, 1922.

*Trivelli, A. P. H., and S. E. SHEPPARD. The silver bromide grain of photographic emulsions. New York: D. Van Nostrand Co., and Rochester, N. Y.: The Eastman Kodak Co., 1921. 143 p. illus. 8°. $2.50. MFH (Stack)

The scientific results of the Research Laboratory of the Eastman Kodak Company, founded in 1913, have been published from time to time in the scientific and technical journals; but the work on the theory of photography is of such general interest to the public that it has been decided to issue a series of monographs, each of which shall cover a large amount of original work as well as references to the literature of the subject. The present volume, the first of the series, is the result of a complete crystallographic study which establishes the fact that the grains are definitely micro-crystalline and that their formation in the emulsion can be studied by the aid of the recent physico-chemical theories of precipitation and especially of the dispersion theory of Von Weimarn. Book is illustrated with photomicrographs and is provided with an extensive bibliography.

Reviewed in Mining and scientific press, Nov. 12, 1921; Nature, March 9, 1922.

*Twelvetrees, W. Noble. Simplified methods of calculating reinforced concrete members. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. x, 72 p. 2. ed. rev. & enl. diagrs. 8°. $1.50.

VEOM (121)

"The present edition is of wider scope than its predecessor, as it covers simplified methods of calculation for beams, compression members, and members subject to combined stresses. The notation throughout is in accordance with the New Standard Notation approved by the Concrete Institute on 14th April, 1920, and all equations are expressed in standard forms." Preface.

Reviewed in Surveyor, Jan. 13, 1922; Ironmonger, Jan. 7, 1922.

United States. - War Department: Chief of Ordnance. The manufacture of optical glass and of optical systems. A war-time problem. Washington: Gov. Prtg. Off., 1921. v, 309 p. illus. 8°. (Ordnance document no. 2037.) PEH (117)

A history of the intensive efforts made by the Government during the war to provide suitable optical glass for military purposes is followed by well-illustrated technical chapters on glass characteristics, manufacture and inspection; also on the manufacture of lenses and prisms and on the inspection of finished parts and systems. A notable public document.

"The general situation may be summarized by stating that when we entered the war we not only lacked a supply of optical glass, but we lacked information regarding the processes of manufac ture. We had little knowledge of the quality and

sources of supply of the raw materials required. We lacked manufacturing capacity and a trained personnel to handle the problems. The problems to be solved required the cooperation and working together of many diverse elements... There is still room for improvement in many details; but the manufacturing processes are known; there are no secrets and the manufacture of optical glass has become one of factory routine." — §. 14.

Walter, L. H. Directive wireless telegraphy, direction and position finding, etc. The theory and practice of... transmission and reception as applied to the signalling and determination of direction and position on land, at sea, and in the air for wireless operators, navigators, pilots, students, and others. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. xii, 124 p. illus. 12°. 85¢. TTF (121)

Thirteen years ago Mr. Walter introduced the Bellini-Tosi system into England. In this little book he sets forth, without intricate theory, the latest developments in the art, including the results of experi ments conducted by the United States Signal Corps and the United States Bureau of Standards. There is an excellent bibliography and the illustrations are good.

Reviewed in Royal Engineers journal, Feb., 1922; Nature, March 2, 1922.

Whiteley, B. Iron-founding. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. ix, 131 p. illus. 8°. $1.00.

VIP (117)

"This little volume is an attempt to place before those who are not intimately acquainted with the interior of a moulding shop some idea of the material and appliances used, together with the methods of manufacture and the principles underlying the whole. Nothing beyond a general survey of a subject so vast could be attempted." - Preface.

Reviewed in Practical engineer, Dec. 15, 1921; Foundry trade journal, Dec. 15, 1921.

*Winterbottom, James. Cotton spinning calculations and yarn costs. A practical and comprehensive manual of calculations, yarn costs, and other data involved in adapting the machinery in all sections, and for all grades, of spinning and doubling. New York: Longmans, Green & Co., 1921. xi, 280 p. 2. ed. illus. 8°. $4.50.

VLLE (121)

Wolfe, William S. Graphical analysis; a text book on graphic statics. New York: McGraw-Hill Book Co., Inc., 1921. xiv, 374 p. diagrs. 8°. $4.00. PBR (117)

Based upon notes and blue prints prepared and used by the author in his classes at the University of Illinois, with some additional material. Although the object has been to deal with the analysis of stresses, some attention has been given to the determination of loads, and Chapter 9 has been devoted almost exclusively to design.

of

"Besides these [the usual subjects], graphical topics are treated which are not usually found in text books, and sometimes are altogether missing, as for example, centroids, moment, moments inertia, construction of the elastic curve for beams, beams with variable moments of inertia, continuous and fixed beams, trussed and ringed domes, chimneys, reinforced concrete beams of circular section, eccentrically loaded columns, rigid frames, steel towers, and ship calculations... The present book is a good illustration of the statement that graphical methods are beautiful. However, it is doubtful whether mortal engineers will carry the methods as far as the author did."- Engineering and contracting, Dec. 28, 1921.

Also reviewed in Mining and scientific press, Jan. 7, 1922.

Woodhouse, Thomas. The handicraft art of weaving. London: Henry Frowde and Hodder & Stoughton [1921]. xii, 165 p. illus. 8°. 6s. VLD (121)

A well-illustrated handbook, made up of material which originally appeared serially in the Textile recorder. Contains chapters on cloth formation by the movements of the weft yarns; weaving cloth on simple frames; tray looms; preparation of warps or chains for the loom; beaming or winding on the warp. Gobelin, Ardebil and Oriental fabrics, and the weaving of Persian, Donegal and real Axminster rugs and carpets are described, and finally frames for hand weaving are briefly discussed.

Wright, J. C. Automotive repair. Instruction manual of repair jobs for the general repairman and the owner. v. 1. New York: John Wiley & Sons, Inc., 1921. xiv, 530 p. illus. 8°. $3.50. TON (121)

Part 1 of this amply illustrated practical work of 530 pages covers the chassis, engine, electrical equipment, trouble shooting, body and radiator work. Part 2 is an elementary study of the theory of gas engine mechanics, of electricity as applied to the automobile, of lubrication, and of fuels and carburetion. Each "job," or chapter is supplemented by a series of questions. Succeeding volumes will include specialized instructions for electrical, battery, and tire service men. Author, who is a well known automotive educator, is chief of the Industrial Education Service, Federal Board for Vocational Education.

Reviewed in Mechanical world, March 10, 1922.

Wright, 12.

BENZINE: Formanek, 5.

BIOCHEMISTRY: Bertrand, 4.

BLUE-PRINTING: Hall, 6.

BUILDERS' HANDBOOK: Kidder, 8.

CADMIUM: Hofman, 7.
CELLULOID: Boeckmann, 4.

CERAMICS: Malinovzsky, 8.

CHEMISTRY: Argles, 3; Bertrand, 4; Boeck-
mann, 4; Curtman, 5; De Wolf, 5; Dyes,
5; Hall, 6; Lucas, 8; Mellor, 9; Powers,
10; Sherman, 11; Taylor, 11.

COLLOIDS: Taylor, 11.

COLOR: Grammar, 6.

COLUMNS: Salmon, 10.

COMMERCIAL PRODUCTS: Argles, 3.

CONCRETE: Twelvetrees, 11.

COTTON SPINNING: Winterbottom, 12.

DISTILLATION (Fractional): Robinson, 10.

DRAWING: Svensen, 11.

EINSTEIN, A.: Moszkowski, 9.

ELECTRICITY: Dawes, 5; Fleming, 5; Hayes,
7; Richardson, 10; Todd, 11.

ENGINEERING: Audel's, 3.

EXPLOSIVES: Farmer, 9.

FLOTATION: Taggart, 11.

GEOLOGY: Hobbs, 7.

GLASS (Optical): U. S. War Dept., 11.

GRAPHICAL METHODS: Marshall, 9; Soreau,
11; Wolfe, 12.

GRINDING MACHINES: Shaw, 10.
HOUSE DECORATION: Prebble, 10.

HYDRAULICS: Durand, 5.

IRON-FOUNDING: Whiteley, 12.

KNITTING: Buck, 4.

LEAST SQUARES: Leland, 8.

LEATHER: Bennett, 3; Crockett, 4.

LIGHTING (Electric): Fletcher, 5.

LUBRICANTS: Formanek, 5.

MATHEMATICS: Heath, 7; Keynes, 7; Leland,

8.

METALLOGRAPHY: Hall, 6.

METALLURGY: Gowland, 6; Hofman, 7.

MOTOR BOATS: Motor, 9.

MOTOR TRANSPORTATION: Lane, 8.

MOVING PICTURES: Boughey, 4.

PATTERN-MAKING: McCracken, 8; Ritchey, 10.
PETROLEUM: Hager, 6.

PHOTOGRAPHY: Boughey, 4; Trivelli, 11.

PROBABILITIES: Keynes, 7.

PROTEINS: Bennett, 3.

RAILWAY SIGNALLING: King, 8.

REFRIGERATION: Power's, 10.

RELATIVITY: Bolton, 4; Moszkowski, 9;

Schmidt, 10; Thirring, 11.

SEISMOLOGY: Davison, 5.

SEWERAGE: Metcalf, 9.

SOLIDS Beilby, 3.

STEAM BOILERS: Croft, 4; H. S. W. B., 6.

STEEL: Colvin, 4.

STEEL CONSTRUCTION: Ketchum, 7.

SUGAR: Deerr, 5.

SULPHURIC ACID : De Wolf, 5.

SWITCHES AND SWITCHBOARDS: Hayes, 7.

TELEGRAPHY (Wireless): Walter, 12.

TEXTILES: Beaumont, 3; Buck, 4; Curtis, 5;
Winterbottom, 12; Woodhouse, 12.

TIMBER: Haynes, 7.

VITAMINS: Sherman, 11.

WEAVING: Woodhouse, 12.

WELL-BORING: Jeffery, 7.

WESTINGHOUSE, GEORGE: Prout, 10.

ZINC: Hofman, 7.