* * * * * 25c. BOOKS. =MODEL BOILER MAKING.= Contains full instructions for designing and making model stationary, marine and locomotive boilers. Fully illustrated with original working drawings. =METAL WORKING TOOLS AND THEIR USES.= A Handbook for Young Engineers and Apprentices. Shows how to use simple tools required in metal working and model making. Illustrated. =SIMPLE MECHANICAL WORKING MODELS.= How to make and use them, including stationary engine locomotive, steamboat, waterwheel, etc. With 34 illustrations. =MODEL STEAMER BUILDING.= A practical handbook on the design and construction of model steamer hulls, and fittings, with 39 scale drawings. =MACHINERY FOR MODEL STEAMERS.= On the design, construction, fitting and erecting of engines and boilers for model steamers, with 44 scale drawings. =THE SLIDE VALVE.= Simply explained for working engineers. Fully illustrated. =THE LOCOMOTIVE=, simply explained. A first introduction to the study of the locomotive engine, their designs, construction and erection, with a short catechism, and 26 illustrations. =THE BEGINNER'S GUIDE TO THE LATHE.= An elementary instruction book on turning in wood and metal. By P. MARSHALL. 76 pages, 75 illustrations. =GAS AND OIL ENGINES.= A practical handbook on, with instructions for care and running. Illustrated. =STANDARD SCREW THREADS.= A Guide to Standard Screw Threads and Twist Drills. (Small sizes.) Illustrated. =STEAM TURBINES.= How to design and build them. A practical handbook for model makers. Contents of Chapters. 1. General Consideration. 2. Pressure Developed by an Impinging Jet; Velocity and Flow of Steam Through Orifices. 3. Method of Designing a Steam Turbine. 4. Complete Designs for DeLaval Steam Turbines; Method of Making Vanes; Shrouding. 5. The Theory of Multiple Stage Turbines. Fully illustrated with detail drawings and tables. =MECHANICAL DRAWING=, simply explained. Use of instruments, reading and setting out drawings, inking in and finishing, drawings for reproduction, lettering, with 44 illustrations. =ACETYLENE GAS.= How to make and use it. A practical handbook on the uses of Acetylene Gas, suitable apparatus for its generation, hints and fitting up, etc. 34 illustrations. =LETTERING FOR DRAWINGS.= A System of Easy Lettering, by J. H. CROMWELL, with an appendix of eight new alphabets by G. Martin. Giving a variety of very attractive alphabets suitable for engineering and architectural drawings. =8th thousand. 50c.= =PROJECTION DRAWING.= Twelve plates on, by OSWALD GUETH, M.E., Inst. Mech. Drawing, Cooper Inst., N. Y. Arranged in three sections: _Projections_, plate 1, Prisms; 2, Pyramids; 3, Inclined Prisms; 4, Inclined Pyramids. _Sections_, plate 5, Prisms and Pyramids; 6, Cones; 7, Spheres; 8, Various Solids. _Intersections_, plate 9, Prisms; 10, Cylinders; 11, Spheres; 12, Prisms and Pyramids. =Size, 8-1/2[** fraction] ◊ 11 in., sewn, 75c.=