Scientific American Volume 65 Number 20 (November 1891) . COLUMBUS s based on a reputation that has been gainedby sterling qualities, and they now stand Without a T^ival POPE MFG. CO., „ BRANCH HOUSES!2 Warren St New York77 FBANELIN ST., BOSTON. 291 Wabash Ave., , Hartford, Conn. RAINMAKERS IN THE UNITED States.—A full account of the operations in the produc-tion of rain recently carried out under Federal appro-priations in Texas. One illustration. Artificial rainmaking. By Prof. E. J. Houston. Contained in Scien-tific American Supplement, No. 824. Price 10cents. To be had at th
Scientific American Volume 65 Number 20 (November 1891) . COLUMBUS s based on a reputation that has been gainedby sterling qualities, and they now stand Without a T^ival POPE MFG. CO., „ BRANCH HOUSES!2 Warren St New York77 FBANELIN ST., BOSTON. 291 Wabash Ave., , Hartford, Conn. RAINMAKERS IN THE UNITED States.—A full account of the operations in the produc-tion of rain recently carried out under Federal appro-priations in Texas. One illustration. Artificial rainmaking. By Prof. E. J. Houston. Contained in Scien-tific American Supplement, No. 824. Price 10cents. To be had at this office and from all ?Su USE GRINDSTONES? If so, we can supply you. All sizesin on n ted and unmounted, alwayskept in stock. Remember, we make aspecialtyof selecting stones for all spe-cial purposes. VW Ask for CLEVELAND STONE Floor, Wilshire, Cleveland, 0. SAWS A A 1A# ft Wanted 50,000 Sawyers ^3*^ ww and Lumbermen to A send us their full address for a copy of Em- mersons W Book of SAWfS, new 1890 edi- Ation. We are first to introduce^Natural r^WGas for heating and tempering Saws withwonderful eflect upon improving their qua- w lity and toughness, enabling us to reduce __Address EMERSON, SMITH O(Limited), Beaver Falls, Pa. O CO STEAM ROAD ROLLERS. Manufactured by HARRISBURG IDE ANO IDEAL AUTOMATIC PATENT AND CROSS COMPOUND OF EVERY DESCRIPTION. FOUNDRY AND MACHINE WORKS, Harrisburg, Pa., U. S. A. THE INFLUENCE OF SURFACE Con-dition on the Strength of Steel.—A paper describing theresults of a series of experiments recently un
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