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effective utilization of powdered coal in metallurgical furnaces; recent utilization in boilers; tables and useful data; and how to operate a plant. There are 47 new illustrations and 8 additional pages of bibliography. A practical work.

Reviewed in Power, Dec. 14, 1920; Power plant engineering, Feb. 15, 1921.

Herzfeld, J. The mechanical testing of yarns and textile fabrics... Translated from the German. London: Scott, Greenwood & Son, 1920. viii, 209 p. illus. 3. English ed. rev. by D. T. Nisbet. 8°. VLM (121)

Revision of work published in 1902, with considerable re-writing by Professor E. Midgley, head of the Textile Department of Bradford (England) Technical College. Covers microscopical, chemical and mechanical examination. Appendix gives official specifications for the supply of materials for use in the German army.

Hool, George A., and N. C. JOHNSON, editors. Handbook of building construction. Data for architects, designing and constructing engineers, and contractors. New York: McGraw-Hill Book Co., Inc., 1920. 2 v. illus. 8°. VEC (121)

Part

Prepared by forty-six experts in their various fields, these two volumes, totalling nearly 1,500 pages, present a veritable library of theory, design, materi als, construction, estimating, and contracting. 3 covers heating, ventilation, power, water supply, sewage disposal, plumbing, illumination, elevators, mechanical refrigeration, communicating systems, and vacuum cleaning. Provided with a wealth of illustrations, tabulated data and diagrams. Should prove a boon to the reference librarian.

*Hovgaard, William. Modern history of warships, comprising a discussion of present standpoint and recent war experiences, for the use of students of naval construction, naval constructors, naval officers, and others interested in naval matters. London: E. & F. N. Spon, Ltd., 1920. xiii, 502 p. illus. 4°.

VXR (121)

An introduction to the author's Structural design of warships. Describes developments beginning in the early part of the nineteenth century, dealing with each class of vessel and in general with each one of the various navies. Later chapters are more or less technical, giving separately the history of the development of the design and construction of the hull, machinery, ordnance, mines, torpedoes, and armor. Over 200 illustrations. Author is professor of naval design and construction in the Massachusetts Institute of Technology.

Reviewed in Times engineering supplement, Aug., 1920; Technical review, Nov. 23, 1920.

Howe, Harrison E. The new stone age. New York: The Century Co., 1921. xvii, 289 p. illus. 8°. (Century books of useful science.) VEO (121)

Besides the good account of raw materials, manufacture, and ordinary uses, there are chapters on art in cement and concrete, highways, and railroads, bridges, ships, waterproofing, tanks, concrete on the farm, military and miscellaneous uses. Well-illustrated and contains a bibliography and a good index. Howe, J. Allen. Stones and quarries. London: Sir Isaac Pitman & Sons, Ltd. [1920.1 x, 137 p. illus. 12°. (Pitman's common commodities and industries.) PWR (117) Briefly outlines the industry, with chapters on the nature, classification and types of rocks, their

mode of occurrence, covering sandstones, slate, marble, granite and other igneous rocks, with some account of their employment in building, engineering, roads, paving, decoration, and sculpture. Chapters 14 and 15 describe briefly methods of quarrying and the preparation of stone for the market.

Jones, Franklin D. Mechanical drawing, a treatise on the drawing of mechanisms and machine details, including the making of different classes of drawings, the dimensioning, reading and checking of working drawings, numbering and filing systems for drawings, and general drafting room practice. New York: The Industrial Press, 1920. ix, 342 p. illus. 8°. VFD (121)

"Presents the subject in a way that will enable the student to understand what the term mechanical drawing really means in its broadest sense, the essential features of modern drafting practice and the difference between the mere representation of a design by a suitable drawing and the more valuable work of originating and developing the design itself." Preface.

Jones, T. H., and J. D. FRIER. Aeroplane structural design, a book for designers, draughtsmen and students. London and New York: Sir Isaac Pitman & Sons, Ltd., 1920. xii, 267 p. illus. 8°. VDY (121)

Avoids advanced mathematics and endeavors to present this complex subject in "as palatable a form as possible," omitting much that is usually found in standard text-books on structures, graphics, and strength of materials.

"From the point of view of the draughtsman and student the ground is fairly well covered, and modern methods have been appropriately 'boiled down' for the easy comprehension and use of such readers." Times engineering supplement, Nov., 1920.

*Lange, Otto. Die Zwischenprodukte der Teerfarbenfabrikation. Ein Tabellenwerk für den praktischen Gebrauch nach der Patentliteratur. Leipzig: Otto Spamer, 1920. xxiv, 645 p. VOR (118)

"It is a splendidly printed volume, with clear type on good paper. The enormous amount of information is made readily accessible by careful classification, largely based on an alphabetical arrangement and supplemented by an extensive index. 3,627 substances are described, arranged in four series, the derivatives, respectively of benzene, naphthalene, anthracene and phenanthrene... Brief statements are made as to the methods of producing the intermediates, and references to the patent literature...are given... The book is a most important and valuable contribution to the field of coal-tar chemistry and will be an indispensable guide to all who are engaged in either practical or theoretical work."- Henry Leffmann in Journal of the Franklin Institute, Jan., 1921.

Lankester, Sir Edwin Ray. Secrets of earth and sea. London: Methuen & Co. [1920. xvii, 243 p. illus. 12°. OAL (115) A miscellaneous group of attractive scientific articles, on prehistoric times, geology, natural history, the swastika, suspended animation, boring for oil, etc., which originally appeared in various English journals.

Levy, S. I. Modern explosives. London: Sir Isaac Pitman & Sons, Ltd. [1920., ix, 109 p. illus. 12°. VOG (118)

This addition to the series "Common commodities and industries," is intended to give the lay reader an untechnical account of the development of explosives during the war with special reference to the famous British factories at Gretna and Queen's Ferry. Deals with the raw materials, chemistry, acids, propellant

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Also reviewed in Arms and explosives, Oct. 1, 1920; Chemical trade journal, Sept. 4, 1920; Mining journal, Oct. 30, 1920; Chemical age, London, Oct. 2, 1920.

McKinnon, Ernest C. The A. B. C. of storage battery management. London: Electrical Press, Ltd., 1920. 95 p. illus. VGH (121) Written in such a simple way, with careful defini tion of technical terms, that the novice should have few difficulties. Author is chief engineer to The Chloride Electrical Storage Co., England.

Reviewed in The surveyor, Oct. 29, 1920; Engineering, Dec. 31, 1920; Colliery guardian, Nov. 5, 1920; Shipbuilding and shipping record, Nov. 4, 1920; Engineer, Jan. 28, 1921.

Marquand, H. S. Electric welding; its theory, practice, application and economics. London: Benn Brothers, Ltd., 1920. 204 p. illus. 8°. VID (117)

Comprehensive and practical study of all sides of the subject, including processes, equipment, machinery, applications, testing and strength of welds. Contains diagrams, illustrations, and a bibliography.

"Chapter 2, referring to The properties of metals considered from the welding point of view is par ticularly good and should be closely studied as it contains information of the greatest value to those seeking to improve the quality of their work."— Electrician, Nov. 19, 1920.

Matthews, J. Merritt. Application of dyestuffs to textiles, paper, leather and other materials. New York: John Wiley & Sons, Inc., 1920. xvi, 768 p. illus. 8°. VLG (121)

This extension of the author's Laboratory manual of dyeing and textile chemistry makes its appeal not only to the student but to all concerned in the applica tion of dyestuffs. In addition to the scope indicated by the title, there are chapters on dyestuff testing, on the chemical reactions of dyestuffs, and the analysis of textile fibres. Bibliography of 18 pages.

"This new work covers much ground, and may be looked upon as a worthy supplement to the Manual of dyeing, of Knecht, Rawson and Lowenthal... The method of presentation shows the author to be a teacher of great experience, as well as an experienced practitioner in the fields of applied chemistry. These combined characteristics result in a simplicity of style together with a thoroughness of attention to detail.' - Dyer and calico printer, Dec. 15, 1920.

Also reviewed in American dyestuff reporter, Dec. 6, 1920; Canadian chemistry and metallurgy, Feb.,

1921.

Melchior, Roger Leon. Modern lessons on calculating machines. [Toledo: author, OEO (115) 1917., 138 p. 3. ed. 8°. Text book of practical problems for the use of the student in becoming familiar with the machine. *Minikin, R. C. Royal. Practical river and canal engineering. London: Charles Griffin & Co., Ltd., 1920. vii, 123 p. illus. 8°. VDM (121)

Discusses rain-fall, river surveys, water ways, floods, water flow, river training, canalization of rivers, canals. Well illustrated, and has diagrams and maps. Author is chief civil engineer of the Brazilian Development Commission.

Mitchell, William. Our air force, the keystone of national defense. New York:

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Tells the general reader about aeronautics in the world war, pursuit, bombardment, attack and observation aviation, balloons, airships, civil and commercial aviation; what the United States should do now to establish its aeronautical position, and finally a discussion of the future of aeronautics. The author is a brigadier general and, during the war, handled the largest concentration of air forces that has ever been assembled under one command. Well illustrated.

*Moldenke, Richard. Charcoal iron. Lime Rock, Connecticut: Salisbury Iron Corporation [1920]. 64 p. illus. 12°. VIR (115)

Gives history, characteristics and uses, with a list of active charcoal blast furnaces in America.

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Reviewed in Brass world, Jan., 1921; Machinery, Dec., 1920; Iron age, Dec. 23, 1920.

Park, Whyrill E. A treatise on airscrews. London: Chapman & Hall, Ltd., 1920. xii, 308 p. illus. 8°. VDY (121)

Part 1 presents theory in a fairly simple way without heavy mathematics. Part 2 tells of preparation of the airscrew block, shaping and finishing in the white, testing, and special types of construction. In the appendices are specifications for casein cement, glues, and various woods; as well as the Ministry of Munitions' handbook on propeller construction. Well proIvided with illustrations and diagrams. Author is a Whitworth scholar and designer to Lang Propeller Ltd., the methods of which firm are generally followed in this book.

Phillimore, John. Motor road transport for commercial purposes (liquid fuel, steam, electricity)... Introduction by Sir Henry P. Maybury, Director General of Roads. London and New York: Sir Isaac Pitman & Sons, Ltd. [1920. xiv, 212 p. illus. 8°. TON (121)

States advantages and gives advice regarding the selection of the proper vehicle. Much of the volume is devoted to analyses of running costs determined under actual conditions in Great Britain. Chapters on trailers, passenger carrying, organization, account keeping, bonus systems, economies, and clearing houses. Thirty-two plate illustrations.

*Pile, J. Howard. Modern methods of Ford repairing; a complete manual for the Ford repairman, explaining the use of all the up-to-date tools and shop equipment and minutely describing the methods of performing the work on all the different mechanical parts of the car. New York: U. P. C. Book Co. [cop. 1920.1 251 p. illus. 16°. TÓN (121)

Includes detail costs of labor operations covering repair work, also blueprint wiring diagrams.

Pitman's technical primer series, edited by Reginald E. Neale... London and New York: Isaac Pitman & Sons, Ltd. 12°. Ahrons, E. L. The steam railway locomotive... 1920. 114 p. illus.

Meares, J. W. Hydro-electric development... 90 p. illus.

1920.

Fergusson, Frank E. The fundamental principles of water power engineering... 1921. 116 p. illus. Hibbert, L. J. A manual of photographic technique... 1921. 118 p. illus.

This series, it is stated, will comprise about 100 volumes on a large variety of subjects. "Endeavors to present a sound technical survey of fundamental facts, principles, equipment and practice... Will appeal to many general readers who wish for an introductory treatment and general survey of technical matters which, whilst not of too popular a character, is capable of being readily understood by those who are not experts."

*Pomey, J. B. Introduction à la théorie des courants téléphoniques et de la radiotélégraphie...av avec une préface de A. Blondel. Paris: Gauthier-Villars et Cie., 1920. xiv, 509 p. 4°. VGM (121)

Some of the chapters formed the bases of lectures at the Ecole professionnelle supérieure des postes et télégraphes. Includes a large number of formulas useful to mechanical and electrical engineers.

"M. Pomey, in writing the present work, has not only enriched our French scientific literature, but at the same time has rendered a very great service to modern theorists of electricity and to technicians, who wish to acquaint themselves quickly and directly, with new methods of calculating, and to acquire accurate and precise ideas, along with some apperception of the fundamental phenomena, to which they are applied." - A. Blondel in Preface.

Pratt, H. B. Commercial airships...with an introduction by Commander Sir A. Trevor Dawson. London and New York: Thomas Nelson & Sons, Ltd. [1920., xiii, 235 p. illus. VDY (121)

This comprehensive survey traces the development of the airship and shows probable developments and limitations. There are chapters on routes and services, proposed types, stations, costs, weather, handling and navigating, structure, power and propulsion, stability and control, internal arrangements, and the relation of airships to national defence. Appendix contains the log of R-34. Well illustrated with halftones, diagrams, and maps. Author is chief engineer of the airship department of Vickers, Ltd.

Prochaska, Ernest. Coal washing. New York: McGraw-Hill Book Co., Inc., 1921. xii, 382 p. illus. 8°. VHW (117)

Treats in detail old and new processes, with special emphasis on jigs - their evolution, types, and construction. Profusely illustrated and contains many diagrams and a good index.

*Ralston, Oliver C. Electrolytic deposition and hydrometallurgy of zinc. New York: McGraw-Hill Book Co., Inc., 1921. vii, 201 p. illus. 8°. VIT (117)

An interesting history of the process introduces the technical chapters. Special emphasis is placed on methods of purification of solutions before electrolysis. Chapter 10 deals with the details of the work at some of the more important plants. Chapter 11 treats of zinc chemicals produced electrolytically. Author is metallurgist of the Hooker Electrochemical Co., of Niagara Falls.

Rathbun, John B. Aeroplane engines in theory and practice, including notes on the

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design, thermodynamic calculations, and constructional details of all types of aeronautic engines and their accessories. comprehensive illustrated manual of selfinstruction for designers, aeroplane constructors and students. Adapted either for Details schools or home study courses. and dimensions of the Liberty Twelve engine. Chicago: Stanton & Van Vliet Co. [cop. 1921. 464 p. illus. 8°. VDY (121)

Sabin, Alvah Horton. White-lead, its use in paint... New York: John Wiley & Sons, Inc., 1920. ix, 133 p. 12°. VOP (118)

Author believes that basic carbonate white lead is superior to all other white paint pigments. Tells of the various methods of preparation, its properties and application. Designed rather for the user than for the chemist or scientific expert.

Reviewed in Chemical age, London, July 31, 1920; Engineering news-record, Jan. 20, 1921; Nature, Oct. 28, 1920.

Swoope, C. W., and others. Swoope's lessons in practical electricity, an elementary text book. 16th edition rewritten, revised and enlarged by Harry Noyes Stillman and Erich Hausmann... New York: D. Van Nostrand Co., 1920. xiii, 625 p. illus. 8°. VGE (121)

Repeated editions testify to the excellence of this textbook for beginners (first published 1901). Present edition has new lessons on alternating-current apparatus and machinery, alternating-current motors, and radio signalling. Nearly 500 illustrations and many problems, experiments, and questions.

Talbot, Frederick A. All about treasures of the earth. London and New York: Cassell & Co., Ltd., n. d. illus. 8°. VHB (117)

Popular, interesting account of some of the most useful and valuable minerals and metals, their mining and use. Well illustrated.

Thatcher, Roscoe W. The chemistry of plant life. New York: McGraw-Hill Book Co., Inc., 1921. xvi, 268 p. 8°. (Agricultural and biological publications.)

PPE (118)

This comprehensive work by the dean of the department of agriculture of the University of Minnesota aims to furnish a proper foundation upon which to build a scientific knowledge of how plants grow. The student is supposed to have had some training in inorganic and organic chemistry.

Thomas, W. N. The development of bridges. Ealing: Geoffrey Parker & Gregg [1920]. 196, v p. illus. 8°. VEK (121)

Traces bridge history from the primitive to the latest achievements, each chapter dealing with a par ticular type. Chiefly confined to British structures. Attractively illustrated.

Reviewed in Engineering world, Feb., 1921.

*Thompson, Tomey. The engineering enquiry (electrical & mechanical). A new pocket book for engineers for the practical assistance of agents, contractors, engineers, estimating, commercial and technical correspondents, merchants, representatives,

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Aims to give precise technical information to man. ufacturers, salesmen, etc., for making enquiries regarding sales and purchases.

Reviewed in Shipbuilding and_shipping_record, Aug. 19, 1920; Electrical review, London, Nov. 19, 1920; Gas engineering magazine, Sept. 15, 1920.

Thornley, Thomas. Elementary cotton spinning...being a companion volume to "Intermediate or second year cotton spinning" and "Honours or final grade cotton spinning.' 4. ed. rev. and enl. London: Scott, Greenwood & Son, 1920. vii, 310 p. illus. 8°. VLLE (121)

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4th edition (3rd, 1908) shows complete revision and much enlargement. Arranged by questions and answers, and covers all operations.

Verrill, Alpheus Hyatt. Islands and their mysteries. New York: Duffield & Co., 1920. iii, 234 p. illus. 12°. PSG (117)

Entertaining, popular account of coral and volcanic formations, pearl and salt islands, in tropical and frozen seas, the vegetation, the life, and the

romance.

Wade, Charles F. The fireman's handbook and guide to fuel economy. A simple manual for the use of stokers, furnacemen, foremen and others operating and controlling boiler and furnace plant. London and New York: Longmans, Green & Co., 1920. 84 p. illus. 12°. VFH (121)

"Reasons are given for the practice recommended, and the book should be useful to students as well as to the practical workers for whom it is primarily intended. Fundamental principles are explained very clearly, and this is of special importance because working by rule of thumb is quite unsatisfactory as a means of securing fuel economy.' - R. E. Ñ., in Technical review, Jan. 4, 1921. Also reviewed in Heating & ventilating magazine, Dec., 1920.

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Wallace, John. Design of aeroplane engines. London: Benn Brothers, 1920. viii, 238 p. illus. 8°. VFM (121)

Aims to steer a middle course between the technical and the elementary, covering general and detailed design. Based upon articles originally contributed to Aeronautics. Excellent diagrams and illustrations.

Webber, Edoardo. Technical dictionary in four languages, English, Italian, French, and German. London and New York: Sir Isaac Pitman & Sons, Ltd., n. d. 2. ed. 12°. VB (121)

Up-to-date work of over 900 pages arranged alphabetically according to English terms, with foreign equivalents in parallel columns.

Whitby, G. Stafford. Plantation rubber and the testing of rubber. London: Longmans, Green & Co., 1920. xvi, 559 p. illus. 8°. (Monographs on industrial chemistry.) VMV (121)

Part 1 treats of methods for obtaining the milk from rubber trees, collection and coagulation of the latex, conversion of the coagulated milk into sheets and the process of smoking sheet rubber. Part 2 considers rubber from the view-point of the physical chemist, including Young's modulus, Hooke's law, the stress strain curve for rubber, tensile tests and vulcanizing. There are 44 pages of bibliography and a good index.

Reviewed in Chemical and metallurgical engineer ing, Jan. 5, 1921; Journal of the Society of Chemical Industry, Nov. 30, 1920; Canadian chemical journal, Dec., 1920.

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INDEX

Numbers refer to pages.

AERONAUTICS: Desmons, 5; Devillers, 5; Hanby, 6; Jones, 7; Mitchell, 8; Park, 8; Pratt, 9; Rathbun, 9; Wallace, 10.

ATOMS: Crehore, 5.

AUTOMOBILES: Beaumont, 3; Phillimore, 8;
Pile, 8.

AUTOMOBILES (Electric): Beaumont, 3.
BIOGRAPHY: Freshfield, 5.

BRIDGES: Bird, 3; Canada, 4; Thomas, 9.

BUILDING CONSTRUCTION: Hool, 7.
CALCULATING MACHINES: Melchoir, 8.
CANALS: Minikin, 8.

CHEMISTRY: Bancroft, 3; Caven, 4; Couch, 5; Freund, 5; Haas, 6; Hart, 6; Hatschek, 6; Thatcher, 9.

COAL: Gibson, 6; Herington, 6; Prochaska, 9; Wade, 10.

COAL (Powdered): Herington, 6.

COAL TAR: Lange, 7.

COLLOIDS: Bancroft, 3; Hatschek, 6.

COTTON SPINNING: Thornley, 10.

DICTIONARIES: Auerbach, 3; Couch, 5; Webber, 10.

DRAWING: Jones, 7.

DYES AND DYEING: Matthews, 8.

ELECTRICITY: Carhart, 4; Codd, 4; Consoli

ver, 4; Dudley, 5; McKinnon, 8; Marquand, 8; Meares, 9; Swoope, 9; Young, 10.

ENGINES (Aeroplane): Rathbun, 9; Wallace,

10.

ESTIMATING: Thompson, 9.

EXPLOSIVES: Levy, 7.

GASES: Beard, 3.

HYDRO-AEROPLANE: Desmons, 5.

IGNITION SYSTEMS: Consoliver, 4.

INDUCTION COILS: Codd, 4.

IRON Moldenke, 8.

ISLANDS: Verrill, 10.

LOCOMOTIVES: Ahrons, 9.

MANAGEMENT: Bigelow, 3.

MATERIALS: Howe, 7.

MATERIALS (Handling): Broughton, 4.
METALS (Waste): Gee, 6.

MINING AND METALLURGY: Beard, 3; Gee, 6; Hanby, 6; Moldenke, 8; Ralston, 9; Talbot, 9.

MOTORS (Electric): Dudley, 5.
MOUNTAINEERING: Freshfield, 5.
NOMOGRAPHY: Brodetsky, 3.

PAINT: Sabin, 9.

PAPER: Bromley, 4.

PETROLEUM: Cox, 5; Emmons, 5; Hamor, 6. PHOTOGRAPHY: Fraprie, 5; Hibbert, 9. PHYSICS: Auerbach, 3; Carr, 4; Crehore, 5; Williams, 10.

PITMAN'S technical primers, 9.

PLANT CHEMISTRY: Haas, 6; Thatcher, 9.
POWER PLANTS: Meares, 9.
PROPELLERS (Air): Park, 8.

QUARRYING: Howe, 7.

QUEBEC BRIDGE: Canada, 4.
RELATIVITY: Carr, 4.

RIVERS: Minikin, 8.

ROADS: Agg, 3.

RUBBER: Whitby, 10.

SCIENCE (Essays): Lankester, 7.

SHIPS: Fyfe, 6; Hovgaard, 7.

STEAM BOILERS: Wade, 10.

STEAM TURBINE: Callendar, 4.
STEEL: Camp, 4.

STONE: Howe, 7.

STORAGE BATTERIES: McKinnon, 8.

TELEGRAPHY (Wireless): Great Britain, 6; Pomey, 9.

TELEPHONE: Pomey, 9.

TEXTILES: Beaumont, 3; Herzfeld, 7; Thornley, 10.

THERMODYNAMICS: Callendar, 4.

THERMO-ELECTRICITY: Carhart, 4.

WELDING: Marquand, 8; Pagé, 8.

WIRING: Dudley, 5.

WOODWORKING: Bigelow, 3.

ZINC: Ralston, 9.

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