. Scientific American Volume 25 Number 12 (September 1871) . MONITOR MOLDING- MACHINE, JIADE BY R. BALL & CO., Worcester, Mass. Manufacturers of the latest Improved Wood-won king-Machinery for Planing Mills, Car Shops, AgriculturalImplements, Furniture, Sash, Blind, and Door Factoriesetc , etc. Send for Illustrated Catalogue and Price BALL. E. P. HALSTED. CEISUS FOR 1870. A new edition of the Patent Laws, with official rules forproceeding before the Patent ,including Censusof 1870, complete. It shows the population by countiesof all the States and territories, and popula
. Scientific American Volume 25 Number 12 (September 1871) . MONITOR MOLDING- MACHINE, JIADE BY R. BALL & CO., Worcester, Mass. Manufacturers of the latest Improved Wood-won king-Machinery for Planing Mills, Car Shops, AgriculturalImplements, Furniture, Sash, Blind, and Door Factoriesetc , etc. Send for Illustrated Catalogue and Price BALL. E. P. HALSTED. CEISUS FOR 1870. A new edition of the Patent Laws, with official rules forproceeding before the Patent ,including Censusof 1870, complete. It shows the population by countiesof all the States and territories, and population of citiesof over 10,000 inhabitants. Important to every patenteewho has rights to sell. It enables him to calculate thevalue of territory, by the , bound, 25 cents. Mailed on receipt of price-Address, MTTNN & ot ficrENTTFrc American, New York city. $10 A DAY with Stencil Tools. Samplesfree. iMdress A. E. , Springfield, Vt. ©1871 SCIENTIFIC AMERICAN, INC. September 16, 1871-] Jfritirtific Swwtati. 189 BAIRDS. FOR PRACTICAL MEN. MY new revised and enlarged Catalogue ofPRACTICAL AND SCIENTIFIC BOOKS, completeto Sept. 1,1871, 94 pages, 8vo., will be Bent, free of postage,to any one who will favor me with his address. HENRY CAREY BAIRD, INDUSTRIAL PUBLISHER,406 Walnut St., Philadelphia, Fa. IfflPROVEB ^SAFETY8 YALYE! Patented April 19, 18T0. For Locomotives, Steamboats, Stationary or Fire Engines, or any other Boiler requiring Safety Valves. They are giving- universalsatisfaction, and are winningtheir way to public favor andpatronage. They pnssesBmany advantages worthy of par-ticular notice and considera-tion. By their use a boileris not liable to attain anymore pressure than is actu-ally required. It has twoseats, one outside and one i -Mde. making nearly threeinches more opening thanother Valves of the same dimensions. Will not corrodeor stick to the seat, and are perfectly tight. A casecovers the Valve which may be locked. A Sure Preventati
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