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PRINTED AT THE NEW YORK PUBLIC LIBRARY form p56b [iv-20-26 12c]

NEW TECHNICAL BOOKS

Titles marked with a star (*) are not for circulation, but may be consulted in the Science and Technology Division, Central Building, Fifth Avenue and Forty-second Street, daily from 9 a. m. to 10 p.m. Sundays, I p. m. to 10 p. m.

* American Bridge Company. Transmission towers. Pittsburgh: American Bridge Company, 1925. 181 p. charts, diagrs. illus. 8°. VGM (121)

Calculations, diagrams, charts, tables and specifications (including steel radio towers).

Appian Way, pseud. The riddle of the earth. New York: Brentano's, 1925. xiv, 251 p. illus. 8°. $2.50. OAP (117)

Author advances the theory that abnormal weather conditions, earthquakes, and volcanoes are the results of cometary or meteoric impact. However much the reader may disagree with the startling conclusions, the book contains a large number of interesting facts.

*Association of Official Agricultural Chemists. Official and tentative methods of analysis...with an introduction by Harvey W. Wiley. Washington: Association of Official Agricultural Chemists, 1925. xvi, 535 p. 2. ed. revised to July 1, 1924. illus. 8°. $5.00. PMB (119)

This revision, authorized in 1922, contains all the changes in methods adopted at the 1919, 1920, 1921, and 1923 meetings of the association, as well as the polarimetric methods for the determination of sucrose and the methods for the determination of moisture and ash in wheat flour adopted in 1924. Contains complete directions for the accurate analysis of a large number of materials, including fertilizers, soils, plants, insecticides and fungicides, tanning materials and leathers, water, brines, food products, beverages and drugs.

Atkin, Harry. The erection of engineering structures and plant. A handbook for engineers, erectors, foremen and students. London: Chapman and Hall, Ltd., 1925. xii, 198 p. illus. 8°. 9s.6d. VFG (121)

Concisely describes operation of a large variety of equipment. Chapters on colliery work, bridge building, steel chimneys. boiler fixing, unloading heavy vessels, pipe-work, steam traps, and valves.

"The illustrations are for the most part in line, and admirably drawn so as to tell without much explanation their own story.". Ironmonger, Nov. 28,

1925.

Also reviewed in Iron and coal trades review, Dec. 25, 1925; Engineering, Jan. 29, 1926.

Bablik, Heinz. Galvanizing, a theoretical and practical treatise on the subject for the use of works managers, students and others; translated by Charles T. C. Salter. London and New York: Spon and Chamberlain, 1926. 168 p. illus. 8°. 12s. 6d. VIK (117) The author, manager of a large Austrian galvanizing works, states that he has carried out a number of scientific investigations, the results of which are now assembled for the first time. Treats of rust and its prevention, the structure of galvanized coatings, pickling, fluxes, hot galvanizing, raw materials and waste products, theoretical principles of electro-gal

vanizing, the electro-galvanizing plant, sherardizing, the Shoop process, testing and judging galvanized coatings. Good illustrations.

Reviewed in Foundry trade journal, Dec. 31, 1925; Ironmonger, Jan. 2, 1926.

Barnard, J. E., and FRANK V. WELCH. Practical photo-micrography. New York: Longmans, Green & Co., 1925. xii, 316 p. 2. ed. illus. 8°. $6.00. OCG (117)

First edition appeared in 1911. Comprehensive handbook for the advanced student, devoting attention more to method than to apparatus. Special chapter on color-screens, and a few pages on the use of ultraviolet light in photo-micrography. Bibliography.

Baxter, Leon H. Electro-craft in theory and practice. Milwaukee: The Bruce Publishing Company, 1925. 168 p. illus. obl. 12°. $1.50. VGC (121)

Sufficient electrical theory for the bright boy of the seventh or eighth grade to construct a number of devices for which good line drawings have been provided.

* Beaver, C. J. Insulated electric cables. In two parts. 1: Materials and design. London: Ernest Benn, Ltd., 1926. 264 p. illus. 4°. 36s. VGM (121)

An historical outline, and a discussion of the various conducting, insulating, and protective materials, precede the principles of design, which include nomenclature and mechanical principles, conductors, dielectrics, factors in voltage rating, and sheaths. A volume covering manufacture and installation is in preparation.

"A further object I have had in view is the promotion of wider knowledge among cable users of the properties of cables, and a better appreciation of the reasons which govern the various forms of construction and which determine the most suitable types for given duties." — Preface.

Reviewed in Electrician, Dec. 11, 1925.

Beaver, J. L. Elements of alternating currents and alternating current apparatus. London and New York: Longmans, Green and Company, 1926. viii, 370 p. illus. 8°. $4.00. VGI (121)

Beginner's text-book, using vectors extensively, deals with principles and describes the commonest types of apparatus. Alternate proofs are offered to students unfamiliar with the calculus. Numerous questions and problems (mostly with answers) at chapter endings. Author is Assistant Professor of Electrical Engineering, Lehigh University.

* Bennett, Edward, and H. M. CROTHERS. Introductory electrodynamics for engineers. New York: McGraw-Hill Book Company, Inc., 1926. ix, 665 p. illus. 8°. $4.50. VGG (121)

"Adapted to the needs of men with superior apti. tude and keen interest in the subject" with the object of facilitating "the acquirement of a profound under

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