LITERATURE-(Continued) of plane geometry in technical drawing. Not many authors of textbooks in drafting have given this fundamental branch of architectural and mechanical drawing so thorough a treatment as in "Detailing" is often required. With its convenient arrangement and its concise. plain language of the text, opposite each construction, this book undoubtedly will win the favor of teachers and students. Forge Practice. By John Lord Bacon. Published by John Wiley & Sons, New York. Pages 257. Illustrated. Cloth. Price, $1.50. EVERY STUDENT taking forging, whether in a manual training school or college, should have this little book. Instructors in shop practice will find in it much valuable matter. It is written in a simple style, and contains the matter one would expect to find in a book bearing such a title. The fact that it has 273 illustrations shows how well its features are presented graphically. These cuts are practically all sketches showing positions of tools and the pieces being forged. The chapters on Welding and Calculation of Stock are especially good. Other chapters are: Simple Forged Work, Steam Hammer Work, Duplicate Work, Metallurgy of Iron and Steel, Tool-Steel Work, Tool Forging and Tempering, Miscellaneous Work. Friction and Lubrication. A Handbook for Engineers, Mechanics, Superintendents, and Managers, by William M Davis. Cloth. Illustrated. Indexed. 8vo. Pages 250. Published by the Lubrication Publishing Company, Pittsburg, Pa. Price, $2.00. A PRACTICAL BOOK by a practical man. Almost all books dealing with the various kinds of machinery have a few pages on lubrication; but here are 250 pages just on this subject. The book treats of the theory of friction, various lubricants themselves, and the methods. of applying the lubricants. The author "begins at the beginning," starts with the reasons why lubricants are necessary, by a concise discussion on friction and frictional losses. An important chapter is that on testing oils. The various tests for viscosity, flash point, burning point (fire test), specific gravity, evaporation, etc., are carefully explained. Directions for mak Mention The Technical World. INTERESTED IN MECHANICS? Our monthly journal, MODERN MACHINERY, keeps you informed on progress in the mechanical field. Nicely illustrated, interestingly written. Valuable alike to shop man or plant owner. We give here the table of contents of the July, 1904, number. MACHINERY EXHIBIT AT ST. LOUIS.-A RATIONAL BASIS FOR WAGES.-CHAS. C. CHRISTENSEN, M.E.-THE HERSTAL NATIONAL ARMORY.-MOLDING MACHINES.-THE ALTIMETER.-A TRAVELING MACHINE SHOP. -FORMING TWIST DRILLS.-PHOTO TAKEN BY RADIUM.-GERMAN HIGH-SPEED LOCOMOTIVE.-IRON AND STEE PROSPECTS IN FRANCE.-MACHINE FOR SPLITTING WOOD.-NEW FLOATING DOCK IN GERMANY.COST OF STEAM VS. HORSE POWER.-REFRIGERATING MACH'Y IN BATTLESHIPS.-POWERFUL TOYS OF WEALTHY AMERICANS.-WASTED MACHINERY ON PANAMA CANAL.-ELECTRIC POWER ERA IN SCOTLAND. -PNEUMATIC MAIL TUBE TESTS IN CHICAGO.-THE PAY CHECK SYSTEM.-STORY TOLD AT WORLD'S FAIR.-NEW MACHINERY OF THE MONTH.-HINTS IN MECHANICAL ENGINEERING.-QUESTIONS AND ANSWERS. INDUCEMENT:-With every sub ■scription we send free any one of the three Premiums mentioned below. Subscribe now, $1.00 per year. No back numbers furnished. They will keep just as good time as an expensive watch: can be placed anywhere on your desk, or may be carried in your pocket. Once you find how convenient a desk watch is you will wonder how you ever got along without one. The watch is regular pocket size, full nickeled case, keeps accurate time and runs thirty hours with one winding. Did You Ever Feel the Need of a Stylo? A Stylo is a Pencil that writes with Ink-It is not a Pen. There is not a man in the world who uses a lead pencil but has wished that it were possible to have a satisfactory pencil that used ink instead of lead. Well, here it is It is not the old fash ioned stylo with a stiff needle or spring needle; it has just been patented and placed on the market. It is called the Gravity Stylo, and its name signifies the principle on which it works. It is only another instance of going back to Nature's laws to find success. One great advantage about these Stylos is that when left lying on the desk they are at their best; even if left there for several days without any cap on they will not leak and will be ready to write the instant the point touches the paper. For ruling purposes they are unequaled. Ruling done with a Stylo is as even and perfect as that done by machinery. If you have a Stylo you have a pencil that is always ready (just like a lead pencil), the advantage being that ink is used. How Far Do You Walk Did it ever occur to you that perhaps you walked miles and valuable recorder CUT OUT AND MAIL TO-DAY Modern Machinery, Security Bldg. Chicago GENTLEMEN:Enclosed find 81.00 for which please send Modern Machinery for one year, and in accordance with your offer, please send me. free of charge, One Desk Watch. One Stylo. One Pedometer. (Kindly encercle one desired). Yours truly, LITERATURE-(Continued) ing a chemical analysis with simple instruments, add to the practical value of the work. The dividing up of the book into short chapters adds much to its convenience, as information upon the lubrication of any given class of machinery is readily found. There are chapters on lubricating appliances; lubrication of gas engines, automobiles, and street-railway cars; oiling devices and systems; treatment of hot bearings; lubrication of refrigerating, mining, and textile machinery, etc. This is by far the best book we have ever seen on this subject, and one that is worth far more than the price asked for it. Magazines Cassier's Magazine (September)-New York "MATHEMATICS IN ENGINEERING" is the title of a discussion on the value and use of pure mathematics in engineering. The writer, Mr. Thorburn Reid, says mathematicians unconsciously grow to think of the solution of a problem, not as a means to an end, but as the end itself. He advances the idea that mathematics would be more valuable if properly taught. The fact that few teachers are practical engineers is responsible for the prevailing defects. As the teacher seldom, if ever, has an opportunity to check his results by practical application, he naturally gives problems of little practical value, and his methods of analysis are either defective or absolutely wrong. Many incidents are cited, showing the value of practical knowledge, some proving that a shrewd estimate is often as reliable as extended calculation. "Vacuum-Tube Lighting," by D. McFarlan Moore, describes the new form of illumination based upon a gaseous electrical conductor for the source of light. The article sets forth the advantages of the vacuum tube over the arc light, the main points being its diffusion and closer imitation of daylight. The illustrations show rooms lighted by this method, and diagrams indicate relative locations of parts. Mention The Technical World. CYCLOPEDIA OF APPLIED ELECTRICITY F A PRACTICAL GUIDE for MECHANICS, ELECTRICIANS, ENGINEERING STUDENTS and ALL PERSONS INTERESTED IN ELECTRICITY 3 30 IVE Volumes-2,500 Pages-size of pages, 8x10 inches, fully indexed. Handsomely and durably bound in buckram, profusely illustrated with over 2,000 full-page plates, diagrams, plans, sections, tables, formulæ, etc. Invaluable alike to the expert electrician and the apprentice. Thousands of dollars and years of preparation have been required to compile the material for this work. Every section written by an acknowledged authority. Prepared especially for practical, everyday use. Combines the best features of a textbook and a reference work, as every volume is supplemented with a carefully prepared list of test questions to impress the important points upon the reader's mind. A ready reference work for the experienced workman, as it is free from abstract theory and difficult mathematics. A limited number of introductory sets will be sent FREE for examination as soon as received from the press. We are printing an editon for our own use. By increasing the edition we can reduce the cost of manufacture. We are willing to share this saving with those who order now for future delivery. The regular price is $25.00. We will accept reservation orders until the books go to press, at $12.50just half the regular price. The books will be sent by express prepaid on approval and may be returned at our expense if not in every way satisfactory. Those desiring to have a set reserved at the reduced price must send $2.50 with their application as an evidence of good faith. This amount will be credited on the books, or returned if they are not kept. No further payments need be made until December 1st when payment of balance ($10) at the rate of $2 00 per month must begin. Reservations will be filed strictly in order received, those received after books go to press will be returned. Some of the Writers. PROF. F. B. CROCKER, head of Department of Electrical Engineering, Columbia University: author of the sections on Storage Batteries and Management of Dynamo Electric Machinery. PROF. WILLIAM ESTY, head of the Department of Electrical Engineering, Lehigh University: author of the section on Alternating Current Machinery. H. C. CUSHING, Jr., Wiring Expert and Consulting Engineer: author of the section on Wiring for Light and Power. PROF. DUGALD C. JACKSON, Collaborator with PROF. GEORGE C. SHAAD, University of Wisconsin: author of sections on Power Transmission, Electric Lighting and Central Stations. J. R. CRAVATH, Western Editor of the Street Railway Journal: author of the section on Street Railways. PROF. LOUIS DERR, Mass. Institute of Technology: WILLIAM BOYRER, Telephone Expert and Consulting Engineer; CHAS. THOM, Chief of Quadruplex Department Western Union Telegraph Co.: author of section on Telegraphy, and others. -COUPON-Cut out and mail to AMERICAN SCHOOL OF CORRESPONDENCE at Armour Institute of Technology. Enclosed find $2.50 for first payment on half-price sale of Cyclopedia of Applied Electricity. The balance ($10) I will pay in monthly payments of $2.00 each, beginning December 1. It is understood that I may return the set at your expense within five days, and that you will refund the amount paid if the set is not wholly satisfactory to me. Also that you will return the $2.50 if my order is received too late for the half-price sale. (Tech. W. Oct.) Partial Table of Contents. Part I.-Static and Dynamic Electricity-Primary Batteries-Ohm's Law-Wire Calculations-Electrical Measurements-Wiring for Light and Power-Electric Telegraph, including the Duplex and Quadruplex. Part II.-Theory of Dynamo-Electric Machinery-Design and Construction of Dynamos and Motors-Types of Machines - Storage Batteries, including Theory, Management and Types. Part III.-Incandescent and Arc Lighting-Electric Railways, including Car Wiring. Line Construction, ThirdRail and Multiple-Unit Systems-Management of Dynamo-Electric Machinery-Power Station Work, including Boilers, Engines and Electrical Machinery-High Tension Transmission. Part IV.-Theory of Alternating Currents-Construction, Types and Operation of Alternators, Transformers, Induction Motors, Synchronous Motors and Rotary Con AMERICAN SCHOOL of CORRESPONDENCE At ARMOUR INSTITUTE OF TECHNOLOGY, CHICAGO The second and revised edition of a Text Book for Home Instruction, High Schools, Manual Training Schools, Technical Schools and Universities. Arranged by HERMAN HANSTEIN Superviser of Drawing Chicago High Schools, Director of Art and Technical Drawing Departments Chicago Mechanics Institute and Columbia Trade and Business School. This book contains One Hundred and Forty of the most important and practical constructions in plain geometry and is the adopted first year's course in Mechanical Drawing of the Chicago High Schools. Price $1.00, postpaid $1.50. Published by Keuffel & Esser Co. NEW YORK CHICAGO ST. LOUIS LITERATURE-(Continued) Under the heading "A Progressive Western Telephone Exchange," H. K. Sprague discusses the new telephone exchange at Boulder, Col., recently completed by the Colorado Telephone Company. The company has outgrown its former quarters, and, at the same time that it is moving into its new building, is remodeling its equipment from the old-style magneto system to the common battery central energy. An interesting discussion of the Electric Power Field by George E. Walsh shows many reasons why the use of electricity for power is becoming more and more popular. Often manufacturing concerns and mills, owing to the difficulty of obtaining fuel, have been obliged to move away from towns and cities where they were suitably located as far as markets and supply of raw material were concerned. With electricity supplied from large central stations, however, at wholesale rates, this difficulty is obviated. Other articles are: Feeding Steam Boilers. Traffic Design of Central Office Switchboards. Automatic Block Signals. How to Make a High-Voltage Testing Battery. Boiler-Room Management. Mention The Technical World. |
