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CATALOGUE OF GOOD, PRACTICAL BOOKS The rules and regulations of the Board of Fire Underwriters m regard to the installation and management of gasoline motors is given in full, suggesting the safe installation of explosive motor power. A list of United States Patents issued on gas, gasoline, and oil engines and. their adjuncts from 1875 to date is included. 640 pages. 435 engrav- ings. Folding plates. Price __............................... .$2.50 GAS ENGINE CONSTRUCTION, OR HOW TO BUILD A HALF-HORSE- POWER GAS ENGINE. By Parsell and Weed. A practical treatise of 300 pages describing the theory and principles of the action of Gas Engines of various types and the design and construction of a half-horse-powt“ Gas Engine, with illustrations of the work in actual progress, together with the dimen- sioned working drawings, giving clearly the sizes of the various details; for the student, the scientific investigator, and the amateur mechanic. This book treats of the subject more from the standpoint of practice than that of theory. The principles of operation of Gas Engines are clearly and simply described, and then the actual construction of a half-horse-power engine is taken up, step by step, showing in detail the making ot Cno Gas Engine. 3d Edition. 300 pages. Price......................SM.ÖU HOW TO RUN AND INSTALL GASOLINE ENGINES. By C. Von Ctjlin. Revised and enlarged edition just issued. The object of this little book is to furnish a pocket instructor for the beginner, the busy man who uses an engine for pleasure or profit but who does not have the time or inclination for a technical book, but simply to thoroughly understand how to properly operate, install and care for his own engine. The index refers to each trouble, remedy, and subject alphabetically. Being a quick reference to find the cause, remedy and prevention for troubles, and to become an expert with his own engine. Pocket size. Paper binding. Price . . 25 cents MODERN GAS ENGINES AND PRODUCER GAS PLANTS. By R. E. Mathot. A guide for the gas engine designer, user, and engineer in the construction, selection, purchase, installation, operation, and maintenance of gas engines. More than one book on gas engines has been written, but not one has thus far even encroached on the field covered by this book. Above all Mr. Mathot’s work is a practical guide. Recog- nizing the need of a volume that would assist the gas engine user in understanding thoroughly the motor upon which he depends for power, the author nas discussea his subiect without the help of any mathematics and without elaborate theoretical ex- planations. Every part of the gas engine is described m detail, tersely, clearly, with a thorough understanding of the requirements of the mechanic. Helpful suggestions as to the purchase of an engine, its installation, care, and operation, form a most valuable feature of the work. 320 pages. 175 detailed illustrations. Price . $3.50 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 m the neia. The best and latest work on farm tractors and tractor power plants. A work needea bv farmers, students, blacksmiths, mechanics, salesmen, implement dealers, designeis and engineers. 500 pages. Nearly 300 illustrations and folding plates. Price GEARING AND CAMS BEVEL GEAR TABLES. By D. Ag. Engstrom. A book that will at once commend itself to mechanics and draftsmen. Does away with all the trigonometry and fancy figuring on bevel gears, and makes it easy for any- one to lav them out or make them just right. There are 36 full-page tables tha* show every necessary dimension for all sizes or combinations you re apt to need, puzzling, figuring or guessing. Gives placing distance, all the angles (mcluai cutting angles), and the correct cutter to use. A copy of this prepares you for any thing in the bevel-gear line. 3d Edition. 66 pages............ CHANGE GEAR DEVICES. By Oscar E. Perrigo. . . • ron A practical book for every designer, draftsman, and mechanic interested m the Hiven tion and development of the devices for feed changes on the different machines roQUir ing such mechanism. All the necessary information on this subject is taken up. analyzed, classified, sifted, and concentrated for the use of busy men who have> not time to go through the masses of irrelevant matter with which such a subject is usu ally encumbered and select such information as will be useful to them. i8