Rose, W. N. Line charts for engineers. London: Chapman & Hall, Ltd., 1923. xi, 95 p. diagrs. 8°. 6s. OEI (117)

"An excellent little treatise on the construction and use of what are generally called alignment diagrams or nomographs, and it is doubtful if a more useful or clearer description could be given within the limits of space and of mathematical equipment on the part of the reader."— Oscar Faber in Concrete and constructional engineering, May, 1923.

Also reviewed in The Surveyor, April 13, 1923; Electrical review, London, July 27, 1923.

*Roux-Brahic, J. Ateliers modernes de préparation mécanique des Paris: Dunod, 1922. xii, 895 p. illus. 8°. 90 fr. VIB (117) Copiously illustrated and complete treatment of modern ore-dressing, including air separation, electromagnetic, and flotation processes.

Sachs, John C. Furs and the fur trade. London and New York: Sir Isaac Pitman & Sons, Ltd., 1923. xi, 128 p. illus. 12°. $1.00. VMG (121)

Supplies the general reader with an account of the use of furs throughout the historical period; characteristics of the various fur-bearing animals and methods and organizations for obtaining the skins; fur-farming; markets and marketing; manufacture and fashion; purchasing and care of furs.

Searle, Alfred B. Refractories for furnaces, crucibles, etc., describing the characteristics of the chief raw and manufactured refractory materials and the processes and machinery employed in their production. London: Sir Isaac Pitman & Sons, Ltd., VEO (121) 1923. x, 170 p. illus. 8°. 5s.

Brief and "as simple as possible considering the complexity of the subject." Lacks the details of the author's Refractory materials, their manufacture and uses. Good bibliography of more extensive works.

Reviewed in Iron and coal trades review, Aug. 24,

1923.

Selvidge, R. W. How to teach a trade. Peoria, Illinois: The Manual Arts Press [1923). 111 p. illus. 12°. $1.00. SSM

Developed in connection with vocational training of soldiers in the United States Army. Aims to present a simple plan for the use of teachers and men in industry who are interested in a "direct method of instruction free from mysticism and make-believe.' Author is Professor of Industrial Education at the University of Missouri.

*Snow, William G. Furnace heating, a practical and comprehensive treatise on warming buildings with hot air. New York: U. P. C. Book Co., Inc., 1923. 259 p. illus. 6. ed. 8°. $3.00. VEW (121)

Practically a reprint of 5. edition, with additional chapter on one-pipe systems.

Southall, James P. C. Mirrors, prisms and lenses, a text-book of geometrical optics. Enl. & rev. ed. New York: The Macmillan Co., 1923. xix, 657 p. illus. 8°. $4.50.

PEH (117)

First edition (1918) expanded by 78 pages which treat mainly of subjects already discussed in some measure in previous pages; "but here, it may be, the serious student will discover much new material not usually to be found in text-books on optics, which, however, is at the basis of some of the best and most fruitful methods of modern optical engineering. Re

Describes principles and operation of a large variety of modern equipment, but does not aim to give the workman instruction in handicraft. 70 detailed plates.

*Stringer, H. Pioneer railway engineering. London: H. F. & G. Witherby, 1923. 269 p. diagrs. 8°. 12s. 6d. TPCM (121)

"To study and lay emphasis upon the economics of a branch of engineering now perhaps most vital to the world's progress. To concentrate for the use of the pioneer engineer information now scattered throughout many standard works. To bring together from the notebook of the executive engineer those variations in practice decreed by climatic and economic considerations prevailing outside Europe." — Preface. Author is resident engineer, Pekin-Mukden Rail

*Van Patten, Nathan. Bibliography of the corrosion of metals and its prevention. Marblehead, Mass.: The author, 1923. 176 p. 8°. VI (117)

2025 entries arranged by authors. Also includes titles cited in lists issued by the Carnegie Library of Pittsburg (1909) and by the Engineers' Society of Western Pennsylvania (1915). Good index. Author is Assistant Librarian, Massachusetts Institute of Technology.

Wallis, T. E. Analytical microscopy, its aims and methods. London: Edward Arnold & Co.; New York: Longmans, Green & Co., 1923. viii, 149 p. illus. 12°. $2.00. PMN (119)

"The majority of these problems are neither bacteriological nor physiological and there is, at the present time, no reliable book to which the analyst can refer for information with respect to the methods employed for the microscopical examination of the numerous miscellaneous substances that are brought in for analysis. Neither is there any existing guide that will indicate the best standard works in which information...may be found. This information is scattered in many volumes, and the necessity for reporting in precise terms makes it essential, for the successful conduct of a general and consulting analytical practice, to be able to find the exact details required." Preface.

Walsh, John W. T. The elementary principles of lighting and photometry... with a foreword by Sir J. E. Petavel... London: Methuen & Co., 1923. xvi, 220 p. illus. 8°. 10s. 6d. VOK (119)

The senior assistant in the photometry division of the National Physical Laboratory (Great Britain) provides a brief and simple guide to the solution of problems most commonly met in lighting engineering, including discussions of vision, measurement and distribution of candle-power, modern light sources, measurement and distribution of illumination, indoor lighting, industrial and school lighting, outdoor illumination, daylight illumination, color in illumination and photometry, light projection. A good classified bibliography.

"A knowledge of elementary science and engineering has been assumed, and no attempt has been made to avoid the use of elementary mathematics in the few places where it is needed but I hope that even the most non-technical reader will nevertheless find the book quite easy reading." — Preface.

Reviewed in Engineering, April 20, 1923; Gas journal, Feb. 14, 1923; Nature, June 16, 1923; Electricity, June 15, 1923.

Webb, H. W. Absorption of nitrous gases. New York: Longmans, Green & Co., 1923. viii, 372 p. illus. 8°. $8.50. VOF (119)

The head of the chemistry department of the Cardiff Technical College discusses both the theory and practice of water absorption and of other processes which have been developed. Chapters on the handling

Includes an account of recent attempts, especially in Germany.

"The cost of engines and the price of petrol stand at present as a bar to success. Power must be saved and consumption reduced by producing a machine of higher efficiency. The more marked the improvement, the greater the load that can be carried for a given gradation of power. Experiments in gliding are purposed to yield the particular knowledge that will lead to improvements."- Introduction.

*White, William Wallace, and WALLACE WHITE. Patents throughout the world. New York: Trade Mark Law Publishing Co. [1923. 244 p. 8°. $7.50. * V (121)

Small work of 1912 expanded into practically a new book. Digests requirements of all patent-issuing countries, with a tabulation answering at a glance most of the questions raised in connection with the filing of foreign patent applications.