"The firm of G. P. Rowell & Co., which issues this interesting and valuable book, is the largest and best Advertising Agency in the United States, and we can cheerfully recommend it to the attention of those who desire to advertise their business SCIENTIFICALLY and SYSTEMATICALLY in such a way: that is, so as to secure the largest amount of publicity for the least expenditure of money." * * * * * THE CELEBRATED _COLD-ROLLED SHAFTING._ This Shafting is in every particular superior to any turned Shafting ever made. It is the most ECONOMICAL SHAFTING to buy, being so very much stronger than turned Shafting. Less diameter answers every purpose, causing a great saving in coupling, pulleys and hangers. It is perfectly round, and made to Whitworth Gage. All who give it a trial continue to use it exclusively. We have it in large quantities. Call and examine it, or send for price list. Address GEORGE PLACE & CO., 126 and 128 Chambers st., New York. * * * * * _N. Y. MACHINERY DEPOT._ GEORGE PLACE & CO., Manufacturers and Dealers in Wood and Iron Working Machinery, of every description, Stationary and Portable Engines and Boilers, Leather and Rubber Belting, and all articles needful in Machine or Railroad Repair Shops. 126 and 128 Chamber st., New York. * * * * * _STURTEVANT BLOWERS._ These are in every particular the best and most perfect Blower ever made. A full assortment of every size on hand, ready to deliver. Address GEORGE PLACE & CO., 126 and 128 Chamber St., New York. * * * * * [Illustration: WROUGHT IRON Beams & Girders] The Union Iron Mills, Pittsburgh, Pa. The attention of Engineers and Architects is called to our improved Wrought-iron Beams and Girders (patented), in which the compound welds between the stem and flanges, which have proved so objectionable in the old mode of manufacturing, are entirely avoided, we are prepared to furnish all sizes at terms as favorable as can be obtained elsewhere. For descriptive lithograph address Carnegie, Kloman & Co., Union Iron Mills, Pittsburgh, Pa. * * * * * MILL OWNERS, ATTENTION.--Our Turbine Water Wheels still ahead. No complications. Simple, compact, and durable. Prices moderate. VALENTINE & CO., Ft. Edward, N. Y. * * * * * THE WOODWARD STEAM-PUMP MANUFACTURING COMPANY, Manufacturers of the Woodward Pat. Improved Safety Steam Pump and Fire Engine, Steam, Water, and Gas Fittings of all kinds. Also Dealers in Wrought-iron Pipe, Boiler Tubes, etc. Hotels, Churches, Factories, & Public Buildings heated by Steam. Low Pressure. Woodward Building, 76 and 78 Center st., cor. of Worth st. (formerly of 77 Beekman st., N. Y.) All parties are hereby cautioned against infringing the Pat. Right of the above Pump. G. M. WOODWARD, Pres't. * * * * *