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MESSRS. MUNN & CO., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine improvements,, and to act as Solicitors of Patents for Inventors. In the mine of busmen have had forty-one experience, and flow have unequaled for the preparation of Patent Drawings, Specifications, and the grosecution of Application for Patents in the United tates, Canada, and Foreign Countries. Messrs Munn It Co. also attend to the preparation of Caveats, Copyrights for Books, Labels, Reissues. Assignments, and Reports on Infringements of Patents. 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Contained in Scientific American supplement, No. 439. Price 10 cents. For sale at this office and by all news dealers in all parta of the country. DELAFIELD'S PAT. SAW CLAMP With saw for cutting metals. Saves all the broken hack-saw blades; In use over two years in all parts of the country. The new clamps have the edges bevelled that hold the saw. By mall, with one blade, 50 cents. Extra blades Sk'' x Star 7 cents each, 70cents per dozen. by mail. Blades 8 x 1", Stubs, 55 cents each, by mail. Discount to dealers. NOKOTON MFG. WORKS, Noroton, Conn. new turedand introduced, address P. O. Box 86,Cleveland, O. PEDERSEN'S PATENT BIT-BRACES With Ratchet and without. In every style and grade of finish. Nickel-plated and polished. Cherry, black walnut, cocobola, and lignumvitae heads and handles. An Indispensable Tool to every Practical Carpenter and Builder Ask for them at the nearest hardware store; if not In stock, send to AMERICAN BIT-BRACE CO. 122,124'"126WaabingtonSt.,Bnffklo,N. Y. 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