SCALES Small Printing Presses! Steel Casting's EVELINA STREET PHILADELPHIA PA. ary outlays for Faints Roofing PURE UNDILUTED PAINTS. FULL BODY AND FULL U. S. STANDARD MEASURE. ASBESTOS ROOFING With WHITE FIREPROOF COATING. Asbestos Boiler Coverings. ASBESTOS CEMENT FELTING AND AIR CHAMBER COVERINGS. H. W. JOHNS MANUFACTURING CO. MACHINISTS' TOOLS. NEW HAVEN MANUFACTURING CO. New Haven Conn. MUNN & CO. TO ADVERTISERS!Renita:Pa AVER & SON'S MANUAL LIMITED WESTON DYNAMO -ELECTRIC MACHINE C TO INVENTORS AND MANUFACTURERS CAMERON Steam Pumps WALKER BROS. PORTLAND CEMENT Box 979


SCALES Small Printing Presses! Steel Casting's EVELINA STREET PHILADELPHIA PA. ary outlays for Faints Roofing PURE UNDILUTED PAINTS. FULL BODY AND FULL U. S. STANDARD MEASURE. ASBESTOS ROOFING With WHITE FIREPROOF COATING. Asbestos Boiler Coverings. ASBESTOS CEMENT FELTING AND AIR CHAMBER COVERINGS. H. W. JOHNS MANUFACTURING CO. MACHINISTS' TOOLS. NEW HAVEN MANUFACTURING CO. New Haven Conn. MUNN & CO. TO ADVERTISERS!Renita:Pa AVER & SON'S MANUAL LIMITED WESTON DYNAMO -ELECTRIC MACHINE C TO INVENTORS AND MANUFACTURERS CAMERON Steam Pumps WALKER BROS. PORTLAND CEMENT Box 979 ItostotiOrass THE TANITE STROUDSBURG PA. SELDOM MONEY MAKE 174 ELM STREET CINCINNATI O. ROCK DRILLING MACHINES'i MANUFACTURED BY D OFFICE Library Academy. PRICE Address M. P. HICCINS FOR READING Writing DRAWING. 921 Chestnut St. Philadelphia. WOOD-WORKING MACHINERY Randolph's New Ditcher WILSON'S NEW YORK CITY COPARTNERSHIP DIRECTORY. 1878-1879. Vol. XXVI. THE TROW CIT Y DIRECTORY C H. W. JOHNS' MIN LIQUID PAINTS. A NEW Copy For All. EDWARD HARRISON JOSEPH C. TODD J. C. TODD WARRANTED THE BEST. LOVEGROVE & CO. 125 N. 4th St. Philadelphia Pa. PEIFECT NEWSPAPER FILE IRON WORKS LIGHT STANDARD 20 INCH Grinding Mill W. A. Foskett PARIS EXPOSITION. Mill Stones and Corn Mills. J. T. NOYE & SON Buffal N. Y. MACHINISTS' TOOLS NILES TOOL WORKS Hamilton Ohio. PIPE TONGS 1 a. DEALERS IN TOOLS P ANCOAST & MAULE MADE. SEND TO MAKERS FOR PRICES. . R. WOPIIING-'1'0N. '239 BROADWAY. NEW YORK. The Most Popular Scientific Paper in the World. THIRTY-THIRD YEAR. 52 Numbers a Year. 37 Park Row New York., scientific american, 1878-04-20


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