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records of average analyses, valuation of ores, dock equipment of the various companies, and descriptions of mines and ores. Well supplied with maps.

*Cushing, H. C., jr. The electric vehicle hand-book... Officially adopted by the Electric Vehicle Section of the National Electric Light Association. New York: H. C. Cushing, jr. [cop. 1920.1 350 p. illus. 12°. TON (121) Gives fundamental principles of care and maintenance, with chapters on batteries, tires, motors, controllers, and accessories. Well illustrated.

Cushman, Allerton S. Chemistry and civilization. Boston: Richard G. Badger [cop. 1920). 151 p. illus. 8°. PKR (118)

Gives brief history of development, biographical mention of famous chemists, and discusses chemistry in the service of man, its relation to industry and war, its present aspect, and its future outlook. Excellent book for the general reader.

Reviewed in Chemical and metallurgical engineer ing, Feb. 2, 1921; Iron age, Feb. 10, 1921; Journal of the Franklin Institute, Jan., 1921; Journal of the American Chemical Society, March, 1921.

Denny, Claude W. The electro-deposition of copper and its industrial applications; the principles and practice of electrodeposition, with special reference to recent developments and applications in the electrodeposition of copper; for students, electroplaters, electrical engineers, designers, and manufacturers. New York: Sir Isaac Pitman & Sons, Ltd., 1921. xii, 108 p. illus. 12°. (Pitman's technical primer series.)

VIK (118)

"The object of this small work is to touch lightly on the principles of electro-deposition from a practical point of view, and to give special attention to the rapid strides made during the last five or six years, covering the period of the war, during which time the deposition of copper has come rapidly to the front." -Preface.

*Dent, John A., and ARTHUR C. HARPER. Kinematics and kinetics of machinery, a text-book for colleges and technical schools. New York: John Wiley & Sons, Inc., 1921. ix, 383 p. diagrs. 8°.

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This work is a revision of notes used by Professor G. A. Goodenough in the University of Illinois, to which is added a chapter on the gyroscope by Profes sor F. B. Seely. "Gives systematic methods for determining velocities, accelerations, and inertia forces which can be applied to practically all mechanisms. These methods are in the main graphical, the compli cated forms of the equations making analytical methods too cumbersome for practical use except in some of the simpler types of machines. If the work is done to a large scale the results should be accurate enough for all practical purposes." There are chapters on the solution of linear differential equations and on the investigation of forces in the gasoline engine. Professors Dent and Harper are teachers in the University of Kansas and Pratt Institute respectively.

Denton, F. M. Elementary principles of continuous-current armature winding. New York: Sir Isaac Pitman & Sons, Ltd., 1921. x, 102 p. illus. 12°. VGI (121) "The object of this book is to give an explanation ...which, while being free from mathematics and therefore easily read by the man who has forgotten his algebra shall yet be general and accurate. The treatment given was devised by the author for the use of students at the Carnegie Institute of Technology, Pittsburgh (Pa.) and is believed to be original. - Preface.

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Dieterich, Karl. The analysis of resins, balsams and gum resins with a bibliography... Translated from the German. 2d English edition, revised & enlarged. London: Scott, Greenwood & Son, 1920. xvi, 431 p. 8°. VOP (118)

"It will be welcomed because it deals very satisfactorily with a very important branch of chemistry which, generally speaking, has not previously received adequate treatment. It should certainly do much to promote standardization and accuracy... The methods of analysis are very sound and are based upon the work of the most renowned authorities. We recommend the book with the greatest confidence to all chemists whose work lies in this direction." Chemical trade journal, Sept. 4, 1920.

Also reviewed in Perfumery and essential oil rec ord, Nov., 1920.

*A Directory of textile merchandise, including textile brands and trademarks... New York: Bragdon, Lord & Nagle Co. [cop. 1921. 630 p. 2. ed., 1921. 8°.

VLA (121)

"To furnish the textile industry and the drygoods trade with a list of trade names, brands and trademarks of products, of which textile fibres, yarns or cloth are the principal materials. Besides the trademark names, it gives the kinds of goods to which the names apply, names of first hand distributors, and in many cases whether goods named are sold to job. bers or to the retail trade."

Dowson, J. Emerson, and A. T. LARTER. Producer gas. London and New York: Longmans, Green & Co., 1920. xviii, 361 p. 4. ed. illus. 8°.

"The appearance of a fourth edition of Messrs. Dowson and Larter's 'Producer gas' is a welcome feature in this industry, inasmuch as the present period more than any recent year demands what might be called a stock taking of present progress in this most economical source of internal combustion engine fuel. Mr. J. Emerson Dowson and Mr. A. T. Larter stand unrivalled as exponents of this, and their fourth edition, besides giving new chapters on progress of gas from peat, gas traction for road vehicles, and gas propulsion of vessels, handles the higher technicalities of the whole question with such authority and precision as to make the bringing up-to-date of this text book a necessity for the industry.". Gas and oil power, Feb. 3, 1921.

Dunkley, W. G. Belts for power transmission; a systematic treatment of belt materials and types of belts, and of the transmission of power by belting, with specially calculated tables. New York: Sir Isaac Pitman & Sons, Ltd., 1920. xii, 104 p. illus. 12°. VFR (121)

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No attempt has been made here to enter into a comparison as to the relative merits of this form of power transmission and other established methods, such as rope driving, chain driving and gearing. The endeavour has been to present and discuss the large number of factors and considerations involved by the subject of belt driving. Some pains have been taken to present the various subjects distinctly and in a logical sequence in order that the whole subject may be appreciated in easy and natural stages." -Preface.

Dunn, Lucius C. Storage battery manual, including principles of storage battery construction and design with the application of storage batteries to the naval service. Annapolis: United States Naval Institute, 1920. 391 p. illus. 8°. VGH (121)

Simple, comprehensive text-book covering capacity and efficiency, the electrotype, plate insulation, jars, hard rubber parts, terminals and connectors, trays,

charging and discharging, also repairs, packing, putting batteries in service, taking them out of service, inspection and testing. Well illustrated.

*Du Parc, Louis, and MARGUERITE N. TIKONOWITCH. Le platine et les gîtes platinifères de l'Oural et du monde. Genève: Société anonyme des éditions Sonor, 1920. 552 p. illus. 4°. PWK (117)

Dr. Kunz, in Science for April 23d, 1920, pronounces this the most complete and authoritative work on the subject. Dr. Du Parc, who is professor of chemistry and petrology in the University of Geneva, spent three years in the Ural mountains and it is the deposits of that region that are emphasized, although there is valuable information concerning other parts of the world. The chapters on refining are comprehensive. There are statistics covering the years 1824 to 1915, as well as extensive bibliographies.

"The geological maps...are models of accuracy and valuable guides for similar investigations. The illustrations are generally clear and good; particular interest attaches to those of famous platinum nuggets which have vanished during the Russian revolution.' A. L. Simon in Mining magazine, March, 1921. Reviewed in Science, April 23, 1920; Mining journal, Jan. 22, 1921.

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Ealand, C. A. The romance of the microscope. An interesting description of its uses in all branches of science, industry, agriculture, and in the detection of crime, with a short account of its origin, history and development. London: Seeley, Service 12°. & Co., Ltd., 1921. 314 p. illus. OCC (117) A brief history followed by an interesting account of recent applications of the microscope and the construction and uses of modern instruments. Reviewed in Nature, Jan. 13, 1921.

Ellis, Carleton, and JOSEPH V. MEIGS. Gasoline and other motor fuels. New York: D. Van Nostrand Company, 1921. xix, 709 p. illus. 8°. VHY (117)

A complete survey, covering the various processes of refining, testing, and especially of cracking. Chapters on the condensation of hydrocarbons from gases; benzol; alcohol; shale oil; and the pyrogenetic treatment of asphalt. Excellent diagrams and many references to important patents.

Reviewed in Mining and scientific press, May 21,

1921.

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"Chemists require detailed information of the methods, both physical and chemical, used in the laboratory to examine the oils, and to be in a position to pass an opinion upon their relative merits; whereas the engineer must be in a position to understand the chemist's report and to put the oil to a practical test with an appreciation of the material which he has under supervision... It has been the author's endeavor to include only those tests which are commonly demanded, and a discussion of those branches of the subject which are of general interest, and to exclude anything which is controversial or highly technical." - Preface.

The opinions of the reviewers are varied. See Chemical age (London), Feb. 5, 1921; Gas and oil power, Feb. 3, 1921; Engineering, March 4, 1921; Engineer, March 11, 1921; Petroleum times, Feb. 5,

1921.

Factory Manager. India-rubber goods manufacture, a practical guide... London: Maclaren & Sons, Ltd., 1920. xi, 496 p. illus. 8°. VMV (121)

Does not go deeply into the sciences of chemistry and mechanics; but is designed for manufacturers and factory hands who take chemical compounds and machines as they find them and make the best use of them. Tells about factory arrangements, requisite machinery, operations of washing, drying, mixing, and vulcanization, the characteristics of rubber and ingredients used, and the manufacturing details of a large number of articles. A revision of articles which originally appeared in the India-rubber journal.

"In the opinion of the reviewer the book is likely to be extremely useful to works managers and others engaged on the purely practical' sides, and can be recommended as an addition to the library of all those interested in rubber manufacture." Philip Schidrowitz in Chemical age (London), Feb. 5, 1921.

[Fairham, William., Woodwork joints, how they are set out, how made and where used; with 430 illustrations and a complete index of 1100 references. Philadelphia: J. B. Lippincott Company [1920]. 214 p. illus. 8°. (The woodworker series.) VEN (121)

Fierz-David, Hans Eduard. The fundamental processes of dye chemistry... Translated by Frederick A. Mason. London: J. & A. Churchill, 1921. xiv, 240 p. illus. 8°. VOR (118)

"For it is obvious that the ordinary laboratory apparatus, which is used in preliminary trials of the method, is not adapted for operations on a larger scale. So the process must be tested in miniature with such apparatus as may be subsequently magnified for large scale production... The book is divided into four sections, dealing with intermediates, dyes, technical details and, finally, a section on analy tical methods for testing the products. It is thoroughly practical, numerous examples being given in detail of the most modern processes used in the production of typical dyes and intermediates. There is no other book in English, we believe, of quite the same character, wherein the fundamentals of theory and works practice are combined... The English translation, so far as one can judge by a comparison of certain sections with the original German edition, is very much better done than most books of this kind."- Chemical age, London, March 5, 1921.

Fletcher, F. Morley. Wood-block printing; a description of the craft of woodcutting & colour printing based on the Japanese practice... with drawings and illustrations by the author and A. W. Seaby. Also collotype reproductions of various examples of printing, and an original print designed and cut by the author, printed by hand on Japanese paper. London: Sir Isaac Pitman & Sons, Ltd. [pref. 1916. xxiii, 132 p. illus. 12°. (The artistic crafts series of technical handbooks, edited by W. R. Lethaby.) MDO

Attractive and practical, giving history, methods of cutting blocks, preparation of paper, ink, color, and paste for printing, detailed methods of printing, and a chapter on cooperative printing. Appendix contains prints, collotype plates and a brief bibliography.

Foltzer, Joseph. Artificial silk and its manufacture... Translated from the French by T. Woodhouse. New York: Sir Isaac Pitman & Sons, Ltd., 1921. xi, 244 p. illus. 8°. VLNE (121)

This up-to-date work treats fully of the development of the various processes. Chapters 20 and 21

discuss the organization and equipment of a plant; and chapter 22 states the distinctive characteristics, properties and uses of natural and artificial silks. There is also an interesting chapter on the conversion of cellulose into artificial hair, thread, ribbons, felt, leather, films, wall decorations, and cloths for flowers, bookbinding, waterproofing and ordinary textures. 117 detailed illustrations.

Gates, Philip. Tool and machine setting for milling, drilling, tapping, boring, grinding and press work; a practical guide to the setting and manipulation of tools and machines with data and examples from practice. London: Sir Isaac Pitman & Sons, Ltd., 1921. x, 93 p. illus. 12°. (Pitman's technical primer series.)

VFC (121)

Georgevics, George von, and Eug. GrandMOUGIN. A text-book of dye chemistry (The chemistry of dye stuffs)... Translated and revised from the 4th German ed. (with additions) by Frederick A. Mason. London: Scott, Greenwood & Son, 1920. xvi, 560 p. 4°. VOR (118)

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.It goes more into detail than any other work of this description, and the historical chapters are accurate and interesting... In carrying out the work of translation advantage has been taken of the opportunity to bring the subject matter up to date and revise the text where desirable. Chief among these alterations and additions in the present edition are: the tables indicating the relationships of the various derivatives of benzene, toluene, naphthalene, and anthracene; the chapters on aniline dyes which have been rewritten; a new section dealing with the antho cyans; the chapter on anthraquinone dyes and vat colors; an account of recent work on carminic acid and curcumin; and lastly, a list of books connected with the chemistry of dyes. The translation is entirely new, and where possible references to works published between 1913 and 1920 are made. Also, in most cases, British patents are referred to, as well as the German." The Dyer and calico printer, Nov. 1, 1920.

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Outlines characteristics of crude oil, its origin, geology, exploitation and refining; the rectification and refining of petrol; recovery of petrol from casinghead gas, cracked spirit and shale naphtha; and the adaptation of petrol to certain precise requirements. The importance of standardization of testing is emphasized and chapter 5 deals with this subject somewhat in detail. Has 26 illustrations and 30 tables.

Grabau, Amadeus W. A text-book of geology. Part 1. General geology. Boston: D. C. Heath & Company [1920]. xviii, 864 p. illus. 8°. PTD (115)

An extensive survey of the subject, including classification and principal types of rocks, volcanoes, aqueous and biogenic rocks, elastic material, rocks of the earth's crust, metamorphism, a discussion of the movements of the earth's surface and their geological effects and two chapters on sculpturing of the earth's surface. Beautifully and copiously illustrated.

Griffiths, Edgar A. Engineering instruments & meters. London: George Routledge [1920]. xxiv, 360 p. illus. 4°.

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"It is impossible to describe in one volume all types of engineering instruments and meters, but the

author has succeeded in covering a very wide field in a highly satisfactory manner. He has taken the wise step of including descriptions of instruments, which are at present used only in very accurate scientific work, in the belief that the novel features of these will ultimately be embodied in the appliances used for routine tests. The scientific principles underlying the various methods of measurements described are dealt with in a simple, yet thorough manner, and the book is provided with a large number of excellent drawings and photographs.”. The Tech nical review, Feb. 15, 1921. Also reviewed in Times engineering supplement, March, 1921.

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Griffin, Roger Castle, editor. Technical methods of analysis as employed in the laboratories of Arthur D. Little, Inc., Cambridge, Mass. New York: McGraw-Hill Book Co., 1921. xv, 666 p. illus. 8°. PMB (118)

"The book is remarkably complete, the subjects dealt with including the preparation of reagents, gen. eral inorganic and organic analysis, the analysis of metals, paints, oils, fats, waxes, soaps, fuel, wood, paper, textiles, and foodstuffs. Methods for the analysis of a number of miscellaneous substances are added, and the book concludes with a series of tables, with analytical factors and volumetric solutions; it has been written to conform to a standard style throughout, it has been carefully edited, and it is a creditable addition to the McGraw-Hill international chemical series. It should be recognized as an essential in every well-appointed laboratory."- Mining and scientific press, May 21, 1921.

Hammond, John Hays. The engineer. New York: Charles Scribner's Sons, 1921. 194 p. 12°. (Vocational series.) VDC (121)

Deals with the requirements, advantages and shortcomings of the engineering profession with chapters on the special qualifications necessary for the mechanical, civil, mining, electrical, chemical, marine, and military engineer.

Harger, Wilson G. The location, grading and drainage of highways, a concise discussion of general principles illustrated by current and recommended practice. New York: McGraw-Hill Book Co., Inc., 1921. xiii, 294 p. illus. 8°. VDG (121)

This volume, the first of a series of four designed to present the road problem from the standpoint of the constructing engineer, considers scope of programme, general characteristics of the system, classification, layout, appropriation estimates, fundamental principles of design, and reasonable economy in design for both horse and motor traffic. One hundred and thirty-seven illustrations including many cross-sections. Author is Engineer of the New York State Department of Highways.

Hatt, William Kendrick, and W. C. Voss. Concrete work. A book to aid the self development of workers in concrete and for students in engineering. v. 1. New York: John Wiley & Sons, Inc., 1921. xix, 451 p. illus. 8°. VEO (121)

"...It is evident from the volume now available that a remarkably effective piece of engineering literature has been produced. For a great while it has been evident that one of the main troubles with concrete construction is the lack of appreciation on the part of the worker and of his foreman of the essentials of concrete theory and practice. These men are 'practical' men, with all of the faults which that adjective implies. There has been great need for their education, but just how such an education is to be conducted has been difficult to see. Professors Hatt and Voss have attacked this problem. Their book is intended for just such men, as well as for those who are entering the concrete business for the first time

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Fundamentals briefly set forth for factory men interested in chemistry as it bears on the various operations of the factory. Valence, atomic weights, equations, and the nature of oxides, hydrates, salts and acids, and their interactions are briefly explained. There is a chapter on qualitative analysis. Author is associated with the department of chemistry, Ford Institute of Technology, Detroit, Michigan.

*Heermann, Paul. Technologie der Textilveredelung. Berlin: Julius Springer, 1921. ix, 564 p. illus. 8°. VLG (121)

This more or less general treatment of fibres, water, chemicals, dyes and pigments, mercerization, dyeing, printing, and finishing is designed to supplant the work of Hummel-Knecht published thirty years ago. Special features are important legislative acts relating to water, a discussion of Ostwald's color theory (with a color plate), and descriptions of certain processes hitherto scattered throughout the technical periodicals. The numerous illustrations are largely from trade catalogues.

Ibbetson, W. S. Motor and dynamo control. Theory and practice. A book for the motor and switchboard attendant, and all engineers who have the care and control of electrical machinery under their supervision. London: E. & F. N. Spon, Ltd., 1921. viii, 487 p. illus. 8°. VGI (121) *Independent Oil Men's Association. Petroleum annual, 1921 edition. Chicago: The Association [cop. 1921]. 430 p. illus. 4°.

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An unusually attractive and well-illustrated book describing machine and gas engine cam design, master cams, followers, cam cutting and grinding.

Reviewed in Power, April 12, 1921; Engineering world, May, 1921.

*Jeans, James Hopwood. The mathematical theory of electricity and magnetism. Cambridge Eng.): University Press, 1920. vi, 627 p. diagrs. 8°. PGG (121)

"This book promises to become one of the classic works on the mathematical theory of electricity, viewed from the physical standpoint on the lines of Clerk Maxwell... The alterations in this new edi tion are comparatively slight until the last few chapters of the book are reached. Here, in view of the ever increasing importance of electric waves and the electron theory, the chapters on these branches have been entirely rewritten; it is these chapters and an entirely new one dealing with the relativity theory which render the new edition especially interesting. It should, however, be noted that the book, particu

larly in the later chapters, presupposes a mathemati cal knowledge somewhat greater than that at the command of the ordinary student of physics." — F. J. Dykes in Electrician, March 25, 1921.

Jennison, Francis H. The manufacture of lake pigments from artificial colours. London: Scott, Greenwood & Son, 1920. viii, 172 p. illus. 2. ed. rev. 8°. VOP (118)

The subject is treated in a practical way making it possible for the lake-maker to devise his own methods and formulae. Enough of the chemical nature of the materials used is given to enable him to understand the different reactions. There are numerous color plates.

Reviewed in Chemical trade journal and chemical engineer, London, Aug. 7, 1920; Color trade journal, New York, Oct., 1920.

Johnson, Arthur F. The design and construction of power workboats. [Cleveland: Penton Publishing Co., 1920., 113 p. illus. 4°. + VXHG (121)

This practical work gives detailed information on every feature of the subject, including laying down, stem, keel and stern design, wood and steel transverse framing, decks, deck houses, accessories, food storage, heating and lighting. Attractive quarto volume with over one hundred detailed working drawings and diagrams, besides complete specifications and figures for every part.

Johnson, C. S. Household repairs and renovations. London: Evans Brothers [1920]. 173 p. illus. 12°. (The woodworker series.) VBA (121)

Simple and popular, giving practical aids for plaster repairs, adjusting window sashes, care of electric bells, mending broken china, etc.

Johnson, V. E. Modern high-speed influence machines, their principles, construction and applications to radiography, radio telegraphy, spark photography, electroculture, electro-therapeutics, high-tension gas ignition, the testing of materials, etc. London: E. & F. N. Spon, Ltd., 1921. vii, 278 p. illus. 8°. PHD (121)

The author believes that the principal objections against the electrostatic machine may be overcome. He, himself, has experimented for more than fifteen years and he states that he has built apparatus capable of producing from 60 to 120 times the quantity of high-tension electricity that can be generated in the ordinary similar Wimshurst machine. These experi ments, as well as the various types of other makers, are described. Although simply written and unburdened with mathematics, a knowledge of the ordinary phenomena of electrostatics and static electricity is presupposed. 93 illustrations.

Judge, Arthur W. Aircraft and automobile materials of construction. Volume 2, Nonferrous and organic materials; a treatise for aircraft, automobile and mechanical engineers, manufacturers, constructors, designers, draughtsmen, students and others. New York: Sir Isaac Pitman & Sons, Ltd., 1921. xii, 594 p. illus. 8°.

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Treats of aluminum, copper, nickel and their alloys, structure and properties of timber, timber testing, fabrics and coverings, dopes and varnishes, glues and gluing, rubber, paints and plywoods, with an interesting chapter on the x-ray method of examining materi als. Well illustrated, and has many charts and tables.

*Lamb, Horace. Higher mechanics. Cambridge (England): University Press, 1920. x, 272 p. illus. 8°. PBC (117)

Professor Lamb, lately professor of Manchester University, has contributed largely to the literature on advanced mechanics. This book treats of three dimensional kinematics, statics and dynamics, and is a sequel to the author's earlier books on these subjects. The mathematics require familiarity with dif ferential equations.

Reviewed in Nature, Jan. 20, 1921; Engineering, Dec. 24, 1920.

Laut, Agnes C. The fur trade of America. New York: Macmillan & Company, 1921. xv, 341 p. illus. 8°. VMG (121)

Gossipy, interesting story covering the getting, farming, marketing, and dressing of skins. Chapters on broadtail, Persian lamb, astrachan, and krimmer, fur seal, silver fox, etc. Appendix gives laws of United States and Canada, revised to date, on seasons for different furs, laws to preserve game, fur farms, licenses and royalties to game wardens. Part 2 gives history of Hudson Bay Co., picturesque studies on the taking of the beaver, making of moccasins, the Indian trapper, etc.

Lempfert, R. G. K. Meteorology. London: Methuen & Co., Ltd. [1920. x, 186 p. illus. 12°. PRB (117)

In view of the recently recognized importance of meteorology as demonstrated in the war, good books on the subject are very acceptable. The present volume, by the assistant director of the British Meteorological Office, is written in a popular vein, describes methods of weather forecasting and incorporates results derived from new methods of observation, viz.: by means of kites and balloons.

Reviewed in Journal of Franklin Institute, Nov., 1920, p. 751; Meteorological magazine, Jan., 1921, p. 283.

Longfield, Ellsworth M. Sheet metal drafting; prepared in the Extension Division of the University of Wisconsin. New York: McGraw-Hill Book Company, Inc., 1921. x, 236 p. illus. 8°. (Industrial education series.) VND (121)

Designed for correspondence-study instruction, each chapter discusses a different principle, such as rectilinear figures, wired and intersecting cylinders, planning for quantity production, triangulation of scalene cones and transition pieces. Well illustrated.

Low, David Allen. Heat engines, embracing the theory, construction, and performance of steam boilers, reciprocating steam engines, steam turbines and internal combustion engines. New York: Longmans, Green & Co., 1920. vii, 592 p. illus. 8°. VFM (121)

"We have no hesitation in saying that this volume will be deemed in every way a fit companion to Professor Low's well-known and excellent treatises on machine drawing, practical geometry, and applied mechanics. It is distinguished by the same lucid treatment, the same comprehensiveness, the excellence of the illustrations and general arrangement." Engineer, March 11, 1921.

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rigorous, will furnish the student with numerous examples of the application of the principles of the science. It is with this object in view that four chapters have been devoted to the phase rule and its applications." - Preface.

"A working knowledge of the calculus has been, and is yet, one of the greatest weaknesses of many post-graduate students in chemistry and their teachers in many instances. The broadening out of the science is essential, and to date very few books have appeared which in various ways did not excuse the student from effort. The result has been that few graduates have the power of mathematics and physics behind their chemistry. To the student of physical chemistry the book will be found sufficiently advanced to call for his best concentration and yet leave him a higher plane in the original papers of Gibbs and others."- Canadian chemistry and metallurgy, April, 1921.

Merritt, William W. Optical shop practice... A text book for the beginner. A complete treatise... with the collaboration of the greatest mechanical minds of the trade. Chicago: Professional Press, Inc. [cop. 1920. 82 p. illus. 8°. PEH (117) Simple, practical handbook giving in detail methods of lens cutting, chipping, edging, surfacing,

etc.

Mickel, Adelaide. Stenciling. Peoria, Ill. The Manual Arts Press [cop. 1920]. 62 p. illus. 8°. MAR p.v.

This attractive work "undertakes to assist the reader in acquiring the technic of stenciling in sev eral mediums upon various surfaces. Detailed descriptions are given of the materials and equipment used; also of the various processes employed in using the different mediums for stenciling, together with many drawings and photographs of stenciled objects, suitable for home and school work. It includes selected problems appropriate for the different grades in the elementary school and in the high school." Preface.

Moyer, James A. Gasoline automobiles. New York: McGraw-Hill Book Co., 1921. vi, 261 p. 8°. TON (121)

"A clear, brief and interesting presentation of the essential principles of automobile construction and operation. The book furnishes practical help to driv ers who, when faced by ordinary operating troubles, want to know how to locate the cause and apply the remedy." Announcement.

Pagé, Victor W. The modern motor truck, design, construction, operation, repair, commercial applications. A complete treatise on all forms of motor trucks propelled by gasoline or electric power, considering in detail everything one needs to know about motor trucks, their care, operation and commercial use... The illustrations defining construction of parts are made from accurate motor truck engineering drawings. New York: The Norman W. Henley Publishing Co., 1921. 962 p. illus. 8°. TON (121)

Painton, Edgar T. Small single phase transformers explaining a commercial method of design, making possible economy of material and accurate predetermination of characteristics, and giving information enabling the amateur to design and construct a transformer meeting his own requirements. London and New York: Sir Isaac Pitman & Sons, 1921. x, 95 p. illus. 16°. VGI (121)

"The methods of design indicated are the cheapest possible, with the employment of the minimum

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