and operations, especially measuring tools. Chapters on materials; heat treatment; soldering, brazing, and lacquering; forge tools and processes. 542 illustrations. Author is workshop superintendent at the London County Council School of Engineering and Navigation.

Reviewed in Engineering, April 28, 1922.

Radio, the principles underlying radio communication. From data prepared by the Bureau of Standards. New York: World Radio Company [1922]. 349 p. illus. 12°. $1.00. TTF (121)

A wealth of authoritative information in compact form.

Reiche, Fritz. The quantum theory. Translated by H. S. Hatfield and H. L. Brose. New York: E. P. Dutton & Co. [1922] 183 p. diagrs. 12°. $2.50.

PAT (117) Broad outline of most important features - origins, development and ramifications. Bristles with mathematics. 54 pages of notes and references. Author is Professor of Physics at the University of Breslau.

*Ricardo, Harry R. The internal combustion engine. v. 1: Slow-speed engines. London: Blackie & Son, 1922. vii, 488 p. illus. 8°. £1, 10s. VFM (121)

Principles, efficiencies, mechanical details, balancing, and governing set forth with good illustrations and large type. Devoid of heavy mathematics and complex thermodynamics. Impartial discussion of merits and demerits of the Diesel engine. v. 2 (High-speed engines) is in preparation.

Reviewed in Marine engineer and naval architect, Dec., 1922; Shipbuilding and shipping record, Dec. 21, 1922.

Ricker, C. W., and C. E. TUCKER. Electrical engineering laboratory experiments. New York: McGraw-Hill Book Co., 1922. xiv, 310 p. illus. 8°. $2.25. VGC (121)

Development of notes used for several years at the Massachusetts Institute of Technology. Experiments on 56 topics. At the end of each procedure is a list of results which can be determined from the data given. Aims to make the student rely upon his own resources, exert his own initiative, and do some original thinking. Ripper, W., and others. Aircraft steels and material... London: Constable & Co., 1922. vii, 209 p. illus. 8°. 16s.

VDY (121) Lectures at the University of Sheffield with the cooperation of the Royal Aeronautical Society.

Introduction (W. Ripper); Some notes on aircraft steels and their inspection (R. K. Bagnall-Wild); Aircraft drop forgings (Leslie Aitchison); Case-hardening steels (W. A. Thain); Cold worked steels for aircraft (Leslie Aitchison); Materials for aircraft from the point of view of the engine designer (A. J. Rowledge); The economical use of steel in aircraft (Ă. A. Remington).

Robinson, Clark Shove. The recovery of volatile solvents. New York: The Chemical Catalog Co., Inc., 1922. 188 p. illus. 8°. $2.50. VOF (119)

Elementary principles; application of solid adsorbing agents to solvent recovery; recovery of vapors by condensation and cooling; cooling and compression combined; scrubbing by means of liquids; abstracts of periodical and patent literature. Author is Assistant Professor of Chemical Engineering at the Massachusetts Institute of Technology.

"Presented in much detail and very thoroughly." Henry Leffmann in Journal of the Franklin Institute, Jan., 1923; Journal of physical chemistry, Jan., 1923.

*Sabatier, Paul. Catalysis in organic chemistry... Translated by E. Emmett

Reid.

New York: D. Van Nostrand Company, 1922. xxiv, 406 p. 8°. $5.00. POD (119)

A large amount of information from scattered sources brought together in convenient and suggestive form and with abundant footnote citations. Unusually complete author and subject indexes. Author is head of the science department of the University of Toulouse. The translator is Professor of Organic Chemistry in Johns Hopkins University.

Reviewed in Journal of the Franklin Institute, Jan., 1923; Journal of physical chemistry, Jan., 1923. *Schultz, Gustav. Farbstofftabellen. Band 1: Organische und anorganische Farbstoffe. Berlin: Weidmannsche Buchhandlung, 1923. xxii, 388 p. 6. rev. ed. 4°. VOR (119)

v. 1 is a thorough revision of the 5th edition (1914). v. 2 will contain tables of the newer coloring materials, raw materials, intermediate products, etc. Standard reference.

Sherlock, R. L. Man as a geological agent, an account of his action on inanimate nature... with a foreword by A. S. Woodward. London: H. F. & G. Witherby, 1922. 372 p. illus. 8°. £1. PSD (117)

Shows extensive statistical research, chiefly for Great Britain, on denudation, excavation, attrition, subsidence, accummulation, sea-coast alterations, circulation of water, climate and scenery. Special chapter on London. Bibliography of 11 pages. Useful reference for the scientist as well as interesting for the general reader.

Reviewed in Science progress, Jan., 1923.

Sisco, Frank T. Technical analysis of steel and steel works materials. New York: McGraw-Hill Book Co., 1923. xiii, 543 p. illus. 8°. $5.00. VIR (117)

Aims "to present the best, most accurate and rapid methods for routine steel analysis, the best and most convenient methods for the analysis of all steel works materials, and to offer a few hints on the equipping and organization of a laboratory for routine work with a few details on the cost and method of its operation." - Introduction.

Sleeper, M. B. Construction of new type transatlantic receiving sets. Complete information, with special drawings, hook-ups and photographs, on how to build and use

Information is also given on the use and external connections of the loud speaker and its application in receiving high speed signals from distant stations. Schedule of the trans-oceanic stations and the recent recommendations of the National Board of Fire Underwriters is included. New York: The Norman W. Henley Publishing Co., 1922. 113 p. illus. 8°. Paper cover. 75¢. TTF (121)

The radio experimenter's handbook New York: Norman W. Henley Publishing Co., 1922. 143 p. illus. 12°. 75¢. TTF (121)

"All deeply theoretical and mathematical discussions have been omitted, and the apparatus considered limited to simple and practical instruments capable of receiving signals from the radio phone broadcasting stations as well as the radio telegraph stations on sea.' - Preface.

Smith, J. O. Modern radio operation. New York: Wireless Press, 1922. 133 p. illus. 8°. $1.75, TTF (121)

Working of transmitting and receiving equipment of the vacuum tube type explained without theory or

mathematics. United States radio laws and regulations. Detailed values of component parts of the Armstrong super-regenerative receiver.

Steinman, D. B. A practical treatise on suspension bridges, their design, construction and erection. New York: John Wiley & Sons, Inc., 1922. viii, 204 p. illus. 8°. $4.00.

D. Van Nostrand Co., 1922. xiii, 416 p. illus. 8°. $4.50. PPK (119)

Stress formulas corrected to conform to modern practice and reduced to simple form, with curves for their solution. Data and illustrations to determine type, proportions, specifications and details. Examples of different types worked out by methods that have proven most efficient. Successive stages in erection of representative structures. Design charts in appendix.

Reviewed in Engineering news-record, Dec. 21, 1922; Canadian engineer, Jan. 16, 1923.

*Stodola, A. Dampf- und Gasturbinen, mit einem Anhang über die Aussichten der Wärmekraftmaschinen. 5. rev. & enl. ed. Berlin: Julius Springer, 1922. xii, 1111 p. VFK (121)

4°.

Foremost work on the subject. Exceeds 4th ed. (1910) by 403 pages and 248 illustrations. Complete revision. Thermodynamical theory and practical details of a large number of engines. Chapter on the gas turbine. Author is associated with the Technical High School of Zürich.

*Tables annuelles de constantes et données numériques de chimie, de physique et de technologie, publiées sous le patronage du Conseil international de recherches et de l'Union internationale de chimie pure et appliquée... v. 4, parts 1-2, années 19131916. Chicago: University of Chicago Press, 1921-22. 2 v. 4°. 240 fr. for 2 vols. PKT (119)

"It represents great labor and care and it is fortunate that the material has been presented in such excellent form and so conveniently classified. The main text is in French but the running heads, which give information as to the special subjects on each page, are in French, German, English, and Italian... Takes rank at once among the most valuable reference works of the worker in the physical sciences." Henry Leffmann in Journal of the Franklin Institute, March, 1923.

Thorpe, Jocelyn Field, and C. K. INGOLD. Synthetic colouring matters: Vat colours. London and New York: Longmans, Green & Co., 1923. xv, 491 p. 8°. $5.50.

VOR (119)

Instruments and general methods fully described; with data for various oils, fats, waxes, dairy products, flesh foods, eggs and egg substitutes, and volatile oils. Numerous bibliographies. Author was formerly chemist to the Ohio State Pure Food and Drug Commission. Oils, pigments, paints, varnishes, etc. A concise treatise on the manufacture, properties, and uses of liquid protective and decorative coatings and their ingredients for students and all those concerned with the making or application of these materials. London: Sir Isaac Pitman & Sons, Ltd., 1922. x, 114 p. illus. 12°. (Pitman's technical primers. no. 54.) 85¢. VOP (119)

"The manufacture or origin of the materials used in the liquid compositions is dealt with briefly, but their properties and mode of use are described more fully, with special reference to the technical points concerned in the manufacture of the coating and in the question of the values and deficiencies of the finished articles from the point of view of the user.' Preface.

*Walker, J. Ewart, and R. BRUCE FOSTER. Patents for inventions. London and New York: Sir Isaac Pitman & Sons, Ltd., 1922. xiii, 377 p. 8°. $7.50. *V (121)

Principles and practice of British Patent Office. Samples of forms.

Reviewed in Nature, Nov. 18, 1922. *Watson, W. A text-book of practical physics. 3. ed. revised by H. Moss. London and New York: Longmans, Green & Co., 1922. xviii, 635 p. illus. 8°. $3.50. PAF (117)

Advanced and detailed laboratory reference (2. ed. was published in 1917). New experiments added, notably those on the continuous flow calorimeter and on the viscosity of gases. Some of the tables and other constants have been brought up to date. 282 illustrations. Author (died 1919) was Professor of Physics in the Imperial College of Science and Technology, London; also prominent in poison-gas investigations for the British Army.

Weber, Gustavus. The Weather Bureau; its history, activities and organization. New York: D. Appleton & Co., 1922. xii, 87 p. 8°. (Institute for Government Research. Service monographs of the United States government. no. 9.) PLD (117)

Bibliography, p. 71-81.

Weingreen, J. Electric power plant engineering. New York: McGraw-Hill Book Co., 1922. xi, 511 p. 3. ed. illus. 8°. $5.00. VGMB (121)

About 50 pages more than 2. ed. (1913.) Does not include the steam plant. New material on oil switches, open-air switches, lightning arresters, substations, reactive coils, synchronous condensers, and wall outlets. Practical and non-mathematical.

Reviewed in Journal of electricity, March 1, 1923.

outset have been reduced to a minimum, the text soon gets beyond the grasp of the average general reader. Bibliography.

*Weyman, Geoffrey. Modern gasworks chemistry. London: Benn Brothers, Ltd., 1922. ix, 184 p. illus. 8°. 25s. VOL (119)

Avoids chemical and physical theories, as well as the relative merits of various types of plants; but discusses methods of plant control and analytical processes in everyday use. A knowledge of gas-making is assumed. References at chapter endings.

Reviewed in Iron and coal trades review, Feb. 9, 1923; Nature, March 17, 1923; Analyst, Feb., 1923.

Whitehead, A. N. The principle of relativity with applications to physical science. Cambridge, England: University Press, 1922. xii, 190 p. diagrs. 8°. 10s. 6d.

PAT (117)

General philosophical principles, physical applications, and an elementary theory of tensors. Knowledge of physics and higher mathematics essential.

Williams, Henry Smith. Practical radio. New York: Funk & Wagnalls Co., 1922. xiv, 413 p. illus. 8°. $1.75. TTF (121)

Mysteries carefully explained by this well-known writer of popular scientific works. Directions for simple sets. Chapter on radio control of distant apparatus. Copiously illustrated.

Wilson, Fras. Raynar. Railway-signalling: automatic; an elementary treatment of the purposes, equipment and methods of automatic signalling and track circuits for steam and electric railways for railwaymen, students and others. London and New York: Sir Isaac Pitman & Sons, Ltd., 1922. xiv, 116 p. illus. 12°. 85¢. TPD (121)

"A fair working knowledge of electricity is assumed, and therefore no explanation of electrical matters is attempted; on the other hand, no previous knowledge of automatic signalling is assumed, and elementary principles are dealt with before leading to the latest developments." - Preface.

Wimperis, H. E. The internal combustion engine, a text-book for the use of students and engineers. London: Constable & Co., Ltd., 1922. xvi, 320 p. 4. ed. rev. & enl. illus. 8°. 12s. 6d. VFM (121)

Theory and practice of gas engines, gas producers, oil and petrol engines.

"Includes some account of the notable advances made in internal combustion engine theory and practice as a result of the intense stimulus of the war. Much of it arose from the growth of aviation." Preface.

Reviewed in Marine engineer and naval architect, Jan., 1923.

Wollaston, T. Roland. Filtration, an elementary treatise on industrial methods of equipment for the filtration of liquids and gases for those concerned with water supply, ventilation, and public health: chemists, mechanical engineers, and others. London and New York: Sir Isaac Pitman & Sons, Ltd., 1922. x, 100 p. illus. 12°. 85¢. (Pitman's technical primers. no. 47.) VÓF (119)

Brief, well illustrated account of chemical precipitation, coagulation, and sedimentation; physical action of filters; chemical and bacterial action; industrial filtration; public water supplies; centrifugal and vacuum filtration; filtration and clarification of oil; filtration of oil.

Reviewed in Nature, Nov. 18, 1922; Chemical news, Nov. 3, 1922.

*Woods, Frederick S. Higher geometry, an introduction to advanced methods in analytic geometry. Boston: Ginn & Co., 1922. x, 423 p. 8°. $5.00. OLA (117)

Basis for advanced work in algebraic as distinguished from differential geometry. Presupposes elementary knowledge of calculus, plane geometry, and determinants. Numerous problems. Author is Professor of Mathematics at the Massachusetts Institute of Technology.

Young, George J. Elements of mining. New York: McGraw-Hill Book Co., Inc., 1923. xv, 671 p. 2. ed. illus. 8°. $6.00. VH (117)

Completely revised and in part rewritten, Prospecting, boring, drilling and blasting, rock breaking, transportation and hoisting, drainage, ventilation and illumination, support of workings, open-pit mining, alluvial mining, development, underground methods, organization and operation, accounting, accidents and miners' diseases, examination of deposits.

"The illustrating... is unusually well conceived. It contains little but diagrams, and each of these is made to serve a distinct and useful purpose. The perspective diagrams illustrating stoping methods are especially good." ·Canadian mining journal, Feb. 16, 1923.

ANALYSIS (Pharmaceutical): Thurston, 11. ASTRONOMY: Jones, 7.

AUTOMOBILES: Favary, 5; Forbes, 5.

BRIDGES: Steinman, 11.

BRUSH MAKING: Kiddier, 7.

CATALYSIS: Sabatier, 10.

CEMENT WORK: Lemos, 7.
CERAMICS: Clay, 4.

CHEMICAL DICTIONARY: Thorpe, 11.

CHEMISTRY: Lewis, 7; Newth, 8.

CHEMISTRY (Plant): Haas, 6.
COAL: Gibson, 6.

COLLOIDS: Holmes, 6.

COLOR VISION: Peddie, 9.

COSTS (Construction): Gillette, 6.

COTTON Crabtree, 4.

DETERMINANTS: Few, 5.

DIESEL ENGINES: Chalkley, 4; Orton, 9.

DRAFTING: Bishop, 3; Merritt, 8.

DYES: Schultz, 10; Thorpe, 11.

DYNAMOS: Pender, 9.

ELECTRICITY (History): Mottelay, 8. ELECTRICITY IN AGRICULTURE: Allen, 3. ELECTRICAL ENGINEERING: Bliss, 4; Karapetoff, 7; Pender, 9; Ricker, 10; Weingreen, 11.

EMULSIONS: Clayton, 4.

ENGINES (Gas and Oil): Chalkley, 4; Kershaw, 7; Orton, 9; Ricardo, 10; Wimperis, 12.

FILTRATION: Wollaston, 12.

FLAVORING MATERIALS: Clarke, 4.
FORGING (Drop): Hayes, 6.
FOUNDRIES: Dwyer, 5.

FOODS (Analysis): Thurston, 11.
FUEL (Smokeless): Greene, 6.
GASWORKS CHEMISTRY: Weyman, 12.
GASWORKS RECORDERS: Levy, 7.
GEOLOGY: Lahee, 7; Sherlock, 10.
GRINDING: Grinding, 6.

ICE AGES: McCabe, 8.

INSPECTION: Allcut, 3.

INSULATION: Hemming, 6; Matthis, 8.

LINEN: Moore, 8.

LUBRICANTS: Hyde, 7.

MACHINE SHOPS: Pull, 9.

MACHINERY (Domestic): Allen, 3.

MATERIALS (Aeronautical): Ripper, 10.

MATHEMATICS: Christman, 4; Few, 5; Woods,

12.

METALLURGY: Pile, 9; Sisco, 10.

METEOROLOGY: Moore, 8; Weber, 11.

MINES AND MINING: Dole, 4; Young, 12.
MOTORS (Electric): Dover, 4; Pender, 9.

NAVAL ARCHITECTURE: Attwood, 3; Gray, 6.
NAVIGATION: Keen, 7.
NITROGEN Partington, 9.

OIL ANALYSIS: Gill, 6.

PAINTS: Gardner, 5; Truelove, 11.

PATENTS: Walker, 11.

PHONOGRAPH: Mitchell, 8.

PHOTOGRAPHY: French, 5; Mayer, 8.

PHYSICS: Watson, 11.

PLASTICS: Hemming, 6.

PYROTECHNICS: Brock, 4.

QUANTUM THEORY: Reiche, 10.

RADIO: Ballantine, 3; Easy course, 5; Keen, 7; Packer, 9; Radio, 10; Sleeper, 10; Smith, 10; Williams, 12.

RADIUM: Amer. Inst. of Radium, 3. RELATIVITY: Einstein, 5; Nordmann, 8; Poor, 9; Weyl, 11; Whitehead, 12.

RESINS: Ellis, 5.

SHEET METAL WORK: Neubecker, 8.
SHIPBUILDING: Duckworth, 5; Fougner, 5.
SHIPS: Protheroe, 9.

SHIPS (Concrete): Fougner, 5.

SIGNALLING (Railway): Wilson, 12.

SOLVENTS: Robinson, 10.

SPECTRA: Fowler, 5.

STARCH Auden, 3.

STEEL (Analysis): Sisco, 10.

STEEL (Structural): Black, 3; Bland, 4.

TABLES (Physical and Chemical): Tables, 11. TESTING (Mechanical): Batson, 3.

TEXTILES: Dyer, 5; Hooper, 6; Moore, 8.

THERMODYNAMICS: Lewis, 7.

TURBINES: Croft, 4; Kearton, 7; Stodola, 11.

ULTRAVIOLET LIGHT: Luckiesh, 8.

VARNISH: Gardner, 5; Truelove, 11.

VELVET: Cooke, 4.

VOLCANOES: Griggs, 6.

WATER POWER: Italy, 7.

WEAVING: Hooper, 6.

WEIGHING MACHINES: Owen, 9.

X-RAYS: Kaye, 7.