Wireless Telegraphy and Telephony

CATALOGUE OF GOOD, PRACTICAL BOOKS LATHE WORK LATHE DESIGN, CONSTRUCTION, AND OPERATION, WITH PRACTICAL EXAMPLES OF LATHE WORK. By Oscar E. Perrigo. A new revised edition, and the only complete American work on the subject, written by a man who knows not only how work ought to be done, but who also knows how to do it, and how to convey this knowledge to others. It is strictly up-to-date in its descriptions and illustrations. Lathe history and the relations of the lathe to manu- facturing are given, also a description of the various devices for feeds and thread cutting mechanisms from early efforts in this direction to the present time. Lathe design is thoroughly discussed, including back gearing, driving cones, thread-cutting gears, and all the essential elements of the modern lathe. The classification of lathes is taken up, giving the essential differences of the several types of lathes including, as is usually understood, engine lathes, bench lathes, speed lathes, forge lathes, gap lathes, pulley lathes, forming lathes, multiple-spindle lathes, rapid-reduction lathes, precision lathes, turret lathes, special lathes, electrically-driven lathes, etc. In addi- tion to the complete exposition on construction and design, much practical matter on lathe installation, care and operation has been incorporated in the enlarged 1915 edi- tion. All kinds of lathe attachments for drilling, milling, etc., are described ana complete instructions are given to enable the novice machinist to grasp the art of latno operation as well as the principles involved in design. A number of difficult machining operations are described at length and illustrated. The new edition has nearly 500 pages and 350 illustrations. Price........................$2.50 WHAT IS SAID OF THIS BOOK: “ This is a lathe book from beginning to end, and is just the kind of a book which one delights to consult,—a masterly treatment of the subject in hand.”—Engineering News, “ This work will be of exceptional interest to anyone who is interested in lathe practice, as one very seldom sees such a complete treatise on a subject as this is on the lathe.’ — Canadian Machinery. TURNING AND BORING TAPERS. By Fred H. Colvin. There are two ways to turn tapers; the right way and one other. This treatise has to do with the right way; it tolls you how to start the work properly, how to set the lathe, what tools to use and how to use them, and forty and one other little things that you should know. Fourth, edition....................25 cents LIQUID AIR LIQUID AIR AND THE LIQUEFACTION OF GASES. By T. O’Conor Sloane. This book gives the history of the theory, discovery, and manufacture of Liquid Air. and contains an illustrated description of all the experiments that have excited the wonder of audiences all over the country. It shows how liquid air, like water, is carried hundreds of miles and is handled in open buckets. It tells what may be ex- pected. from it in the near future. A book that renders simple one of the most perplexing chemical problems of the century. Startling developments illustrated by actual experiments. ' It is not only a work of scientific interest and authority, but is intended for the general reader, being written in a popular style—easily understood by every one. Second edition. 365 pages. Price.............................$2.OU LOCOMOTIVE ENGINEERING AIR-BRAKE CATECHISM. By Robert H. Blackall. This book is a standard text book. It covers the Westinghouse Air-Brake Equipment including the No. 5 and the No. 6 E. T. Locomotive Brake Equipment; the K (QæcK. Service) Triple Valve for Freight Service; and the Cross-Compound Pump, in® operation of all parts of the apparatus is explained in detail, and a practical way.oi finding their peculiarities and defects, with a proper remedy, is given. It contains 2,000 questions with their answers, which will enable any railroad man to pass any examination on the subject of Air Brakes. Endorsed and used by air-brake instruc- tors and examiners on nearly every railroad in the United States. 26th Edition. 41i pages, fully illustrated with, colored plates and. diagrams. 20