MODERN EXAMINATIONS OF STEAM ENGINEERS; OR, PRACTICAL THEORY EXPLAINED AND ILLUSTRATED. By W. H. Wakeman. Bridgeport, Conn. : American Industrial Publishing Company. 1895. Pp. 272. 12110. Diagrams. Price $2. This work comprises full and complete answers to 300 questions for the use of engineers and firemen, when preparing to make application for examination for United States government and State license and for the information of engine builders, boiler makers, etc. Al-though there are already books on the same subject, a work of this kind. when it is as practical as the present one, cannot fail to have a large number of readers. The rules and formulas are simple and are accompanied with examples. The value of the work would have been enhanced by the insertion of illustrations. The author, being a practical steam engineer himself, well knows the wants of the working engineer, and has put into this work such knowledge and information as is best adapted to their use, making it altogether one of the most complete and comprehensive guides for the busy workers in the engine room, boiler works, and machine shops that bas been published. ELEMENTS O F THE MATHEMATICAL THEORY OF ELECTRICITY AND MAGNETISM. By J. J. Thomson, M.A., F.R.S., Cambridge. New York: Macmillan & Company. 1895. Pp. 504. 12mo. 133 figures. Price $2.60. The author is Cavendish professor of experimental physics in the University of Cambridge, the stronghold of the mathematical sciences in England. With the exception of a few paragraphs, no more advanced mathematical knowledge is required from the reader than an acquaintance with the elementary principles of the differential calculus. It is not necessary to make use of advanced analysis to establish the existence of some of the most important electromagnetic phenomena. The study of these simple cases will in the estimation of the author be of advantage even to students whose mathematical attainments are sufficient to enable them to fol low the solution of the more general cases. The work will undoubtedly fulfill a useful purpose in our more advanced institutions of learning. NOTES ON DESCRIPTIVE GEOMETRY, WITH EXERCISES. BV W. L. Ames. Terre Haute, Ind. 1895. Pp. 88. 18mo. 86 figures. Price 50 cents. It is evident to all who have taken note of the trend of the practice of mechanical drawing in the best draughting offices that the use of the third quadrant in pojecting will become universal. In the study of descriptive geometry, however, with few exceptions, the first angle projection is taught. The writer, realizing that the methods taught should harmonize with the practical application in mechanical drawing as practiced, has for some time used the third angle in teaching descriptive geometry. There being no text books so arranged, notes were prepared for the student s use. These notes revised are now published. THE ART ORNAMENTER AND MODERN SIGN WRITER New York : Excelsior Publishing House. Small 4to. Price $2.50. This work comprises over thirty good sized plates, giving alphabets, raised scrolls and other ornaments which are useful to the sign writer. The serolls are particularly fine. The alphabets include block, old English, Egyptian, Roman script, German text, antique, etc. THE PRACTICAL APPLICATION OF THE SLIDE VALVE AND LINK MOTION TO STATIONARY, PORTABLE, LOCOMOTIVE AND MARINE ENGINES, WITH NEW AND SIMPLE METHODS OF PROPORTIONING THE PARTS. By W . S. Auchinloss, (j.E. New York: D. Van Nostrand Company. 1895. Pp. 138. 8vo. 52 illustrations and plates. Price $2. In the past twenty-five years this book has had a phenomenal sale, the present being the thirteenth (revised) edition. It has proved itself both a standard authority with mechanieal engineer? and draughtsmen and a valued test book with colleges and technical schools. In the present edition the author has carefully eliminated all abstruse formulae , as he does not consider it advisable to use the higher mathematics for the solution of everyday problems in link and valve motion. The component parts of such motions are always compact and the distances small, consequently they do not involve such delicate angles, etc., as in astronomy and should not be so treated, but all dimensions should be computed either arithmetically or graphically by the most simple and direct processes. The fundamental principles are dealt with to the exclusion of patented devices. ORGANIC CHEMISTRY. The Fatty Compounds. By R. Lloyd Wliiteley. London and New York : Longmans, Green & Company. 1895. Pp. 291. 12mo. Illustrated. Price $1. An excellent work on this branch of organic chemistry. It has been the aim of the author not only to give students an intelligible and connected account of the theory of the subject, but also to provide them with such information as shall enable them to gain a practical acquaintance with it. The work has a good indexa point on which English scientific books are so often at fault. The very sensible plan is adopted of printing the figures which indicate the principal reference in heavy-faced type. YELLOW BEAUTY. By Marion Martin. Chicago : Laird & Lee. 1895. Price 50 cents. A book for children, with 3ix full page half tones, reproduced from paintings by Mme. Henriette Ronner, the famous painter of cats. The 1895-96 catalogue of the Parsons Horological Institute, or School for Watchmakers, at Peoria, Ill., is a most interesting addition to the series of annual catalogues issued by colleges and technical schools. The SCIENTIFIC AMERICAN has heretofore fully illustrated and described this unique school, and the just issued catalogue affords new evidences of the wisdom of its management and the thoroughness of its course of instruction.
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