metal working tools, shear blades, saws, fine cutlery and metal-cutting tools of all descriptions, as well as for all implements of steel, both large and small, the simplest, and most satisfactory hardening and tempering processes are presented. 320 pages, 250 illustrations. Fourth edition. Cloth. Price, $3.00 Steel: Its Selection, Annealing, Hardening and Tempering. By E. R. MARKHAM. This work was formerly known as "The American Steel Worker," but on the publication of the new, revised edition, the publishers deemed it advisable to change its title to a more suitable one. This is the standard work on hardening, tempering, and annealing steel of all kinds. This book tells how to select, and how to work, temper, harden, and anneal steel for everything on earth. It is the standard book on selecting, hardening, and tempering all grades of steel. 400 pages. Very fully illustrated. Fourth edition. Price, $3.00 TRACTORS The Modern Gas Tractor. By VICTOR W. PAGE. A complete treatise describing all types and sizes of gasoline, kerosene, and oil tractors. Considers design and construction exhaustively, gives complete instruction for care, operation ard repair, outlines all prac tical applications on the road and in the field. The best and latest work on farm tractors and tractor power plants. A work needed by farmers, students, blacksmiths, mechanics, salesmen, implement dealers, designers, and engineers. Second edition revised and much enlarged. 504 pages. Nearly 300 illustrations and folding plates. Price, $3.00 TURBINES Marine Steam Turbines. By DR. G. BAUER and O. LASCHE. Assisted by E. Ludwig and H. Vogel. Translated from the German and edited by M. G. S. Swallow. The book is essentially practical and discusses turbines in which the full expansion of steam passes through a number of separate turbines arranged for driving two or more shafts, as in the Parsons system, and turbines in which the complete expansion of steam from inlet to exhaust pressure occurs in a turbine on one shaft, as in the case of the Curtis machines. It will enable a designer to carry out all the ordinary calculation necessary for the Construction of steam turbines, hence it fills a want which is hardly met by larger and more theoretical works. Numerous tables, curves and diagrams will be found, which explain with remarkable lucidity the reason why turbine blades are designed as they are, the course which steam takes through turbines of various types, the thermodynamics of steam turbine calculation, the influence of vacuum on steam consump tion of steam turbines, etc. In a word, the very information which a designer and builder of steam turbines most requires. Large octavo, 214 pages. Fully illustrated and containing 18 tables, including an entropy chart. Price, $4.00 net The Most Valuable Techno-Chemical Recipe Book Ever Offered to the Public! Henley's Twentieth Century Book of RECIPES, FORMULAS AND PROCESSES Price $4.00 THIS book of 800 pages is the most complete Book of Recipes ever published, giving thousands of recipes for the manufacture of valuable articles for every-day use. Hints, Helps, Practical Ideas and Secret Processes are revealed within its pages. It covers every branch of the useful arts and tells thousands of ways of making money and is just the book everyone should have at his command. HENLEY'S BOOKE RECIPES The pages are filled with matters of intense interest and immeasurable practical value to the Photographer, the Perfumer, the Painter, the Manufacturer of Glues, Pastes, Cements and Mucilages, the Physician, the Druggist, the Electrician, the Dentist, the Engineer, the Foundryman, the Machinist, the Potter, the Tanner, the Confectioner, the Chiropodist, the Manufacturer of Chemical Novelties and Toilet Preparations, the Dyer, the Electroplater, the Enameler, the Engraver, the Provisioner, the Glass Worker, the Goldbeater, the Watchmaker and Jeweler, the Ink Manufacturer, the Optician, the Farmer, the Dairyman, the Paper Maker, the Metal Worker, the Soap Maker, the Veterinary Surgeon and the Technologist in general. AN HENLEY SHING O EWYORK A book to which you may turn with confidence that you will find what you are looking for. A mine of information, up-to-date in every respect. Contains an immense number of formulas that every one ought to have that are not found in any other work. 10,000 Practical Formulas and Processes ONE USEFUL RECIPE WILL BE WORTH MORE |