Scientific Books and Periodicals sent to order to any part of the country. Purchases of all kinds promptly attended to. Address A. W. Macdonald, Jr., Eoom 33,87 Park Eow, New York. Manufacturers and dealers of the best crimping machines for boots please send circular and price to C. Kramer,Enterprise,Miss, Box 44. For sale—Poundery and machine shop. For description address 0. F. Griffith, Agt, Mt. Pleasant, Iowa. Nut Machines.—For sale, State, county, shop, or machine rights of nut machines. Address H. C. Hart, Unionville, Conn. $5,000 will purchase one half interest in a valuable patent that will pay $30,000 the coming summer. No capital required except the purchase money. Address E. L. Smith, Buffalo, N. Y. Wanted—address of patentee of machine for converting potatoes into pulp and dry cakes. A. Ott, 33 First ave., New York. J. T. Eaftery, of Eldara, 111., wishes to correspond with parties for the manufacture of water elevators. Photographic apparatus, 1-4 size, for sale cheap. Apply at 56 and 58 Murray st. Hydraulic, steam, and vacuum gages, all sizes, at the lowest prices. Addres E. H. Norris, Paterson, N. J. Pecks patent drop press. For circulars, address the sole manufacturers, Milo Peck & Co., New Haven, Ct. Brick clay lands for sale. Apply 19 Cliff St., New York, Eoom 7. Compound Lathe Chucks—Fairmans patent—The best in the market. Send for circular. Address Hutchinson & Laurence, 8 Dey st. Makers of hand or power brick presses, send circulars to H. Arndt, Fort Plain,N..Y. Inventors and Manufacturers Gazette—an illustrated journal of new inventions and manufactures. Cheapest paper in the world. $1 per year. Sample copies sent. Address Saltiel & Co., Postoffice box 448, or 37 Park Eow, New York City. Fine and complicated watches of every description repaired, etc., in all their branches, by H. F. Piaget, 119 Fulton St., N.Y. A practical workman and author of The Watch. All work warranted. Builders of 8 to 15-horse engines send address,with cut of engine and terms. Object,to select the best to sell for oil purposes. Wanted,3d-hand iron planer, lathe, drill, pipe-cutting machine, and tools for small machine shop. Also, set of rollers. A. Logan & Co., Engine Dealers, Tideoute, Pa. Pickerings Velocipede, 144 Greene St., New York. For descriptive circular of the best grate bar in use, address Hutchinson & Laurence, No. 8 Dey St., New York. See Advertisement. For sale low—Three second-hand presses for punching nuts and washers, all sizes, and other work. Punches and dies for same. Address Geo. H. Hawes, Fall Elver, Mass. Two-set knitting mill for sale—See advertisement back page. Glynns anti-incrustator for steam boilers—the only reliable preventive. Causes no foaming, and does not attack the metals of the boiler. Liberal terms to AgenM. Address M. A. Glynn& Co., 735 Broad, way, New York. W. J. T.—We think the patent asbestos roofing manufactured by H. W. Johns, of this city, is the best substitute for tin or slate. It is cheap and easily applied. Inventors and patentees wishing to get small, light articles manufactured for them in German silver or brass, address Schofield Brothers, Plainville, Mass. Tempered steel spiral springs. John Chatillon, 91 and 93 Cliff St., New York. Two saw mills for sale. C. Bridgman, St. Cloud, Minn. Eockwood, 839 Broadway, N. Y., photographs architectural or mechanical drawings and plans to a scale. Also.photographs of machinery. For solid wrought-iron beams, etc., see advertisement. Address Union Iron Mills, Pittsburgh, Pa., for lithograph, etc. Punching and shearing machines. Doty Manufacturing Co., Janesville, Wis. Specialties in the Machinists line. Parties desiring work of a special character address S. W. Gardiner, 6 Ailing St., Newark, N. J. Eesponsible and practical engineers pronounce the Tapper Grate Bar the best in use. Send for a pamphlet. L. B. Tupper, 130 West St., N.Y. Iron.—W. D. McGowan,iron broker,73 Water sfcPittsburgh.Pa. N. C. Stiles pat. punching and drop presses, Middletown, Ct. Machinists, boiler makers, tinners, and workers of sheet metals read advertisement of Parker Brothers Power Presses. Winans boiler powder, N. Y., removes and prevents incrustations without injuryor foaming; 12 years in use. Beware of imitations. The paper that meets the eye of all the leading manufacturers throughout the United States—The Boston Bulletin. $4 a year.