Supplement to “ Nature,” March 31, 1923 v 

Recent Scientific and Technical Books. 
Volumes marked with an asterisk have been received at “*NATUKK” Office. 
Mathematics 
Assistant Masters, Association of. The Teaching 
of Elementary Geometry: being the Report of a Special 
Sub-Committee appointed by the Incorporated Associa- 
tion of Assistant Masters in Secondary Schools. Cr. 8vo. 
Pp.15. (London: Oxford University Press, 1923.) 1s. net. 
Bauer, E. La Théorie de la relativité. Gl. 8vo. 
Pp. iv+128. (Paris: Librairie de 1’Enseignement 
technique, 1922.) 6 francs. 
Brewster, G. W. Commonsense of the Calculus. 
Gl. 8vo. Pp. 62. (Oxford: Clarendon Press; London: 
Oxford University Press, 1923.) 2s. net. 
Bryan, G. H. Mathematical Tables. Roy. 8vo. Pp. 
27. (London: Macmillan and Co., Ltd., 1923.) 3s. 6d.* 
Bullard, J. A., and Kiernan, A. Plane and Spherical 
Trigonometry. With stereographic projections. Cr. 8vo. 
Pp. 250. (London and Sydney: D.C. Heath and Co., 1923.) 
6s. net; Answers, ts. 6d. net. 
Cunha, P. J. da. Reflexdes sObre a teoria dos con- 
juntos. 8vo, Pp.64. (Lisboa: Imprensa Nacional, 1922.) 
Eddington, A. S. The Mathematical Theory of 
Relativity. Imp. 8vo. Pp. ix+247. (Cambridge: At 
the University Press, 1923.) 20s. net.* 
Fontené, G. La _ Relativité restreinte. Avec un 
appendice sur la relativité généralisée. Gl. 8vo. Pp. 
116. (Paris: Libr. Vuibert, 1923.) 6 francs. 
Geiringer, H. Die Gedankenwelt der Mathematik. 
8vo. Pp. 200. (Berlin und Frankfurt a. M.: Verlag 
der Arbeitsgemeinschaft, 1922.) 35 marks. 
McKay, H. Arithmetic Reconsidered. Cr. 8vo. Pp. 
180. (London: Evans Bros., Ltd., 1923.) 4s. 6d. net. 
Mangoldt, H. v. Einfiihrung in die hdhere Mathe- 
matik fiir Studierende und zum Selbststudium. Large 8vo. 
Band 1: Anfangsgriinde der Infinitesimalrechnung und 
der analytischen Geometrie. 4 Auflage. Pp. xviii+516. 
Band 2: Differentialrechnung. 3 Auflage. Pp. xii +531. 
(Leipzig : S. Hirzel, 1923.) 16,000 Mark jeder Band. 
Orwin, C. S. Farm Costing and Accounts. Cr. 8vo. 
Pp. 31. (London: Benn Bros., Ltd., 1923.) 1s. 6d.° 
net.* - 
Rose, W. N. Mathematics for Engineers. Part 2. 
Second edition. (Directly-Useful Technical Series.) Demy 
8vo. Pp. xiv+423. (London: Chapman and Hall, 
Ltd., 1923.) 13s. 6d. net.* 
Shade, S., and Margolis, 
Technical and Vocational Schools. 
(London : Chapman and Hall, Ltd., 1923.) 
Answers, 1s. 3d. net. 
L. Mathematics for 
Cr. 8vo. Pp. 491. 
12s. 6d. net; 
Mechanics: Mechanical Engineering 
Aeronautical Research Committee. Reports and 
Memoranda. No. 705: Experiments on Complete Models 
of Six Aeroplanes. ts. 9d. net. No. 729: Reduction of 
the Effective Value of Young’s Modulus in Flexible 
Compression Members. 3d. net. No. 772: Model Tests 
of 64 Section Biplane Wings with Flaps. 6d. net. No. 
794: Aerodynamic Loading of Airships. 3d. net. No. 
798: Air Consumption and B.H.P. of Aero Engines. 
Is. 3d. net. No. 804: Tandem Aerofoils. 6d. net. No. 
809: Determination of Rotary Derivatives: with an 
Appendix on Approximate Formule for Rotary Deriva- 
tives. rod. net. (London: H.M. Stationery Office, 
1923. 
Bakes of Trade. Water-tube Marine Boilers: 
Standard Conditions for Design and Construction. 
(London : H.M. Stationery Office, 1923.) 2d. net. 
Colvin, F. H., and Haas, L. L. Jigs and Fixtures: 
a Reference Book showing many Types of Jigs and 
Fixtures in Actual Use, and Suggestions for Various 
Cases. Second edition, revised and enlarged; second 
impression. Med.  8vo. vii+237. (London: 
McGraw-Hill Publishing Co., Ltd., 1922.) 12s. 6d.* 
Croft, T., Edited by. Machinery Foundations and Erec- 
tion. (Power Plant Series.) Ex. Cr. 8vo. Pp. xv +691. 
(London: McGraw-Hill Publishing Co., Ltd., 1923.) 25s.* 
41923.) 
Hepworth, W., and Lee, J. T. Railway Permanent 
Way: Dimensional Theory and Practice. A Manual for 
Engineers, Inspectors, Foremen, etc. (Manchester : 
Charles Lever, 40 King Street West, 1922.) 12s. 6d. net. 
. Hetzel, F. V. Belt Conveyors and Belt Elevators. 
Med. 8vo. Pp. 333. (New York: J. Wiley and Sons, 
Inc.; London: Chapman and Hall, Ltd., 1922.) 25s. 
net. (Corrected entry.) 
Institute of Marine Engineers. Internal Combustion 
Engines: Papers Read and Discussed at the Premises 
of Marine Engineers, 85-88 The Minories, Tower Hill, E.1, 
December 1922. Demy 8vo. Pp. 600. (London: In- 
stitute of Marine Engineers, 1923.) 12s. 6d. net. 
Jacobs, F. B. Cam Design and Manufacture. Med. 
8vo. Pp. vii+122. (London: Constable and Co., Ltd., 
13s. net. 
~ Jamieson, A. A Text-Book on Heat and Heat 
Engines: Specially Arranged for the Use of Engineers 
ualifying for the Institution of Civil Engineers, the 
nstitution of Mechanical Engineers, the Institution of 
lectrical Engineers, the Diplomas and Degrees of 
Technical Colleges and Universities, and Honours Certi- 
ficates of the City and Guilds of London Institute, in 
Mechanical Engineering, and for Engineers generally. 
Vol. 2. Eighteenth edition, rewritten by E. S. Andrews. 
Ex. Cr. 8vo. Pp. xvi+428. (London: C. Griffin and 
Co., Ltd., 1923.) 8s. 6d. net.* 
Leigh, C. W. Practical Mechanics and Strength of 
Materials. Cr. 8vo. Pp. viii+293. (London: McGraw- 
Hill Publishing Co., Ltd., 1923.) 11s. 3d.* 
Logue, C. H. American Machinist Gear Book: 
Simplified Tables and Formulas for Designing, and 
Practical Points in Cutting all Commercial Types of 
Gears. Thoroughly revised by R. Trautschold. Third 
edition; second impression. Med. 8vo. Pp. ix +353. 
(London : McGraw-Hill Publishing Co., Ltd., 1922.) 15s.* 
Moore, H. Some Factors Effecting the Utilisation 
of Heavy Fuel Oils in Internal Combustion Engines. 
Roy. 8vo. Pp. 32. (London: E. and F. N. Spon, Ltd., 
1923.) 5s. net. 
Miiller, C.H., und Prange, G. Allgemeine Mechanik. 
Pp. x+551. (Hannover: Helwing’sche Buchhandlung, 
1923.) 
Ramsey, J. A., and Rosbloom, J. 
Guide for Marine Engineers. Gl. 8vo. Pp. 537. 
don : Chapman and Hall, Ltd., 1923.) 15s. net. 
Ross, J. F. S. An Introduction to the Principles of 
Mechanics. Demy 8vo. Pp. x-+400. (London ; 
Jonathan Cape, 1923.) 12s. 6d. net.* 
Schelest, A. Probleme der wirtschaftlichen Loko- 
motiven. 8vo. Pp. 152. (Leipzig und Wien: F. 
Deuticke, 1923.) 
Snodgrass, J. M., and Guldner, F. H. An In- 
vestigation of the Properties of Chilled Iron Car Wheels. 
Part 2: Wheel Fit, Static Load, and Flange Pressure 
Strains, Ultimate Strength of Flange. Conducted by the 
Engineering Experiment Station, University of Illinois, 
in co-operation with the Association of Manufacturers of 
Chilled Iron Car Wheels. (Bulletin No. 134.) Med. 
8vo. Pp. 72. (Urbana, Ill.: University of Illinois 
Engineering Experiment Station, 1922.) 40 cents.* 
Webb, W. L. Railroad Construction, Theory and 
Practice : a Textbook for the Use of Students in Colleges 
and Technical Schools and a Handbook for the Use of 
Engineers in Field and Office. Seventh edition, revised 
and enlarged. Fecap. 8vo. Pp. xvii+847. (New York: 
J. Wiley and Sons, Inc.; London: Chapman and Hall, 
Ltd., 1923.) 25s. net. 
Wilson, W. M. The Grading of Earth Roads. 
(Circular No. 10.) Med. 8vo. Pp. 27. (Urbana, IIl.:; 
University of Illinois Engineering Experiment Station, 
1923.) 15 cents.* 
2oth Century 
(Lon- 
Physics: Electrical Engineering 
Aeronautical Research Committee. Reports and 
Memoranda. No. 778: An Electric Motor of Small 
Diameter for Use inside Aeroplane Models. 2d. net. 
N 3 
