. Scientific American Volume 77 Number 02 (July 1897) . PHYSICAL AND SCHOOL APPARATUSTOEPLER HOLTZ SELF CHARGING MACHINE For School, College orX Bay work. jy Circular free. E. S. RITCHIE & SONS, Brookllne, ROCK DRILLS AIR COMPRESSORS SIMPLEST. MOST EFFICIENT and DURABLE. RAND DRILL CO. 1 Send for Catalogue. 10 0 Broadway, New York. IMPROVED FILM JOINT I CALIPERS. % 12 sizes. 3 In., 40c., to 24 In., $ a Inside and outside. Joint has smooth ^ and uniform friction. Fine finish. X 13^ Catalogue of Fine Tools free. J The L. 5. STARRETT CO. t ATHOL, MASS., U. S. A. «

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