Wireless Telegraphy and Telephony

CATALOGUE OF GOOD, PRACTICAL BOOKS and dies, and all kinds of sheet metal working tools, shear blades, saws, fine cutlery, and metal cutting tools of all description, as well as for all implements of steel both large and small. In this work the simplest and most satisfactory hardening and temper- ing processes are given. The uses to which the leading brands of steel may be adapted are concisely presented, and their treatment for working under different conditions explained, also the special methods for the hardening and tempering of special brands. A chapter devoted to the different processes for case-hardening is also included, and special reference made to the adaptation of machinery steel for tools of various kinds. Fourth Edition. 288 pages. 201 illustrations. Price............................$2.50 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 instructions for care, operation and repair, outlines all practical 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. 500 pages. Nearly 300 illustrations and folding plates. Price $2.00 THE HOME-MADE TRACTOR. By Xeno W. Putnam. A practical treatise on the construction of small and special purpose tractors in the home workshop from the odds and ends of cast-off machinery available on nearly every farm. This work shows the farmer how, at small expense, to make his gasoline engine conveniently portable by making it self-moving. It guides him in the con- struction of a practical farm tractor that is capable of hauling, harvesting, plowing and doing all the ordinary farm work in which the propulsion of other machinery is re- quired. Twenty-four chapters are contained in this book and it is illustrated with over 153 working engravings showing many successfully built and tested home-made tractors. Bound in cloth, 12mo.