Tells

geology, prospecting, refining, and natural gas. in detail about the securing of land titles; maps and sections; field development; various drilling methods; casings; exclusion of water; high-pressure control; removal of oil; power; storage and transportation; office methods. Copiously illustrated. Bibliographies at chapter endings. Although designed as a textbook the general reader will find much of interest.

Reviewed in Mining magazine, June, 1924.

Wade, Herbert T. Scales and weighing, their industrial applications with special reference to control of plant operation, transportation, and commercial transactions. New York: The Ronald Press Co., 1924. x, 473 p. illus. 8°. $6.00.

VBDG (121)

"The author has done a monumental piece of work in compiling this book." From a review by Wilder D. Bancroft in The Journal of physical chemistry, May, 1924.

*Walker, A. J. The alkali-metals and their congeners. London: Charles Griffin & Co., 1924. xxvi, 379 p. 8°. (A textbook of inorganic chemistry, edited by J. Newton Friend. v. 2.) 20s. PNB (119)

Summarizes the knowledge of hydrogen, lithium, sodium, potassium, rubidium, caesium, copper, silver, gold, and their compounds; also of the radical ammonium and its principal derivatives. References to original sources are unusually numerous.

Walker, Miles. The control of the speed and power factor of induction motors. London: Ernest Benn, Ltd., 1924. 151 p. illus. 8°. 18s. 6d. VGI (121)

The author, Professor of Electrical Engineering in the University of Manchester, England, gave the substance of this work in a course of lectures at the Massachusetts Institute of Technology in 1923.

"The publishers are to be congratulated on the fine reproduction of the figures and the excellent letterpress." Electrician, April 11, 1924.

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Also reviewed in Electrical review, London, April 18, 1924; Electrical world, April 26, 1924.

Weber, Gustavus A. The Patent Office, its history, activities and organization. Baltimore: The Johns Hopkins Press, 1924. xii, 127 p. 8°. (Institute for Government Research. Service monographs of the United States government. no. 31.) $1.00. *V (121)

Outlines difficult and detailed work carried out under discouraging conditions - lack of funds, inadequate equipment and personnel. Has index to various laws affecting the office; financial statements; and a bibliography. A useful library reference.

Reviewed in Journal of the Franklin Institute, May, 1924.

Wellington, S. N., and W. R. COOPER. Low temperature carbonisation. London: Charles Griffin & Co., 1924. ix, 238 p. illus. 8°. $9.50. VHW (117)

Treats of theory and describes systems that have been tried and the difficulties that have been encountered; also of the gases, ammonia, tar and oils produced. Has abstracts of selected British patents.

Reviewed in Engineer, April 25, 1924; Mining and metallurgy, May, 1924.

Wheeler, Charles G. Woodworking, a handbook for beginners in home and school, treating of tools and operations. New York: G. P. Putnam's Sons, 1924. xvi, 369 p. illus. 8°. $3.50. · VEN (121)

Equipment and common operations described in detail and with a wealth of illustrations. Chapter on woodworking machinery and its uses. List of books for reference.

"The judicious use of machinery, either by the pupil or by others for him, greatly enlarges his opportunities, and machinery will not exhaust the possibilities of desirable hand work in wood for a long time to come." Introduction.

Treats of interpolation; difference formulas, determinants and linear equations; the numerical solution of algebraic and transcendental equations; numerical integration and summation; normal frequency distributions; method of least squares; practical Fourier analysis; graduation and smoothing of data; correlation; the search for periodicities; and the numerical solution of differential equations. Authors are teachers in the University of Edinburgh.

Reviewed in Revue générale des sciences, March 30, 1924; Engineering, April 18, 1924.

A short course in interpolation. London: Blackie & Son, Ltd.; New York: D. Van Nostrand Co., 1923. viii, 70 p. 8°. $2.50. OIK (117)

"A knowledge of the theory of interpolation is required by all who make inferences from the results of observation, especially by astronomers, physicists, statisticians, and actuaries... The present text is offered as a short exposition suitable for first-year undergraduates: it is a separate issue of the first four chapters of a larger work by the same authors, dealing with the general field of the calculus of observations." Preface.

*The Year-book of wireless telegraphy and telephony. 1924. London and New York: The Wireless Press, Inc., 1924. lxiv, 910 p. illus. maps. 8°. 15s.

Desk (Tech. Div.)

A mass of information in compact form. Retains most of the features of former editions, but now omits the list of ship stations. Land stations corrected to Dec. 31, 1923. The excellent maps have also been revised. Special technical articles, lists of United States and British patents granted during 1923, bibli ographies and brief biographies.

Aeronautics: Great Britain, 23; Hart, 23;

International, 24.

Air Compressors: Ford, 22.

Aniline: Groggins, 23.

Armature Winding: Croft, 21.

Automobiles: Elliott, 21; La Schum, 25.
Bacteriology: Prescott, 26.

Building Construction: Arthur, 19; Hool,
24; Lescarboura, 25.

Chemistry: Allen, 19; Cohen, 20; Cooper,
21; Cumming, 21; Gardner, 22; Lacey,
24; Loring, 25; Thorpe, 28.
Chemistry (Bibliography): Sohon, 27.
Clay: Searle, 26.

Climate: Koeppen, 24.

Coal (Distillation): Lander, 24; Welling-

ton, 29.

Colloids: Svedburg, 28.

Concrete: Concrete Yearbook, 21.

Crystals: Bragg, 20; Evans, 22.

Electric Motors: Fox, 22; Walker, 29.

Electrical Measurements: Drysdale, 21;

Solomon, 27.

Electricity: Starling, 27.

Electro-Metallurgy: McMillan, 25.
Electroplating: Blum, 19; McMillan, 25.
Engineering: Gibson, 22.

Engineers' Handbook: Tulley, 28.
Engines (Gas and Oil): Bird, 19.

Fats: Myddleton, 26.

Fertilizers: Brenchley, 20.

Fluids: Drysdale, 21.

Forging: Jones, 24.

Fuel: Dunn, 21; Goodrich, 23; Harvey, 24.
Gases: Gibbs, 22.

Geology: Gardiner, 22; Pirson and Schu-
chert, 26.

Gyroscope: Schilovsky, 27.

Heat Measurements: Keinath, 24.
Hydraulics: Lewitt, 25; Medaugh, 25.
Knots: Shaw, 27.

Lamps (Portable): Luckiesh, 25.

Lead: Harn, 23.

Marine Boilers: Stromeyer, 28.
Marine Engineering: Drover, 21.
Mathematics: Feldman, 22; Sanden, 26;
Sheppard, 27; Whittaker, 29.
Metallurgy: Dean, 21.
Oceanography: Johnstone, 24.
Oils: Browne, 20.

Optics: Schuster, 27.
Ore Dressing: Simons, 27.
Oxygen: Friend, 22.

Palaeontology: Swinnerton, 28.
Patents: Weber, 29.

Petroleum: Uren, 28.

Photosynthesis: Bose, 20.

Plumbing: Taggart, 28.

Power Stations: Austin, 19; Bruce, 20;
Suckan, 28.

Printing: Ginsbach, 23.

Radio: Roussel, 26; Yearbook, 29.

Relativity: Freundlich, 22.

Roads: Agg, 19; Belloc, 19; Harger, 23.
Sand: Searle, 26.

Science: Hering, 24; Slosson, 27.

Sewage Disposal: Hardenbergh, 23.
Ships: Hardy, 23; Koester, 24.
Soap: Martin, 25.

Solubility: Hildebrand, 24; Walden, 29.
Stoking (Mechanical): Brownlie, 20.
Switchgear: Coates, 20.

Textiles: Matthews, 25; Nield, 26; Priest-
man, 26; Thornley, 28.

Upholstery: Stephenson, 27.
Varnishes: Morrell, 26.

Ventilation of Mines: Bryson, 20; Had-
dock, 23.

Waste Materials: Bruttini, 20.
Water Supply: Thompson, 28.
Weighing Machines: Wade, 29.
Welding: Atkins, 19.
Woodworking: Wheeler, 29.
X-Rays: Bragg, 20.