ROC -weir CHEAP DURABLE. EMERY STAY SHARP. NO PICKING. To Electrical Worke a DORIvIAN'S VULCANIZERS are used all over the world. That Are Good--Not Cheap Things WESTERN TELEPHONE CONSTRUCTION CO. ELECTRO - CHEMISTRY ILECENT AD ARMSTRONG'SPIPETHREADING CUTTING-OFF MACHINES THE ARMSTRONG MFG. CO. Bridgeport Conn. The Van Norman____. Universal Bench Lathe. Waltham Watch Tool Co. SPRINGFIELD. MASS. THE BACKUS CAS ENGINE Chicago Water Motor and Fan Co. 171-173 Lake Street Chicag Ill. BOSTON ELECTRIC RAILWAY DUD 'WOLVERINE' GAS AND GASOLINE ES NOLVERINE MOTOR WORKS 12 Huron Street: GRAND RAPIDS MICH


ROC -weir CHEAP DURABLE. EMERY STAY SHARP. NO PICKING. To Electrical Worke a DORIvIAN'S VULCANIZERS are used all over the world. That Are Good--Not Cheap Things WESTERN TELEPHONE CONSTRUCTION CO. ELECTRO - CHEMISTRY ILECENT AD ARMSTRONG'SPIPETHREADING CUTTING-OFF MACHINES THE ARMSTRONG MFG. CO. Bridgeport Conn. The Van Norman____. Universal Bench Lathe. Waltham Watch Tool Co. SPRINGFIELD. MASS. THE BACKUS CAS ENGINE Chicago Water Motor and Fan Co. 171-173 Lake Street Chicag Ill. BOSTON ELECTRIC RAILWAY DUD 'WOLVERINE' GAS AND GASOLINE ES NOLVERINE MOTOR WORKS 12 Huron Street: GRAND RAPIDS MICH. ELECTRICAL SUPPLIES G. A. R. NATIONAL ENCAMPMENT ST. PAUL. Potomac SNONC PATENT SECTIONAL ALL IRON TOWERS of 4 and 12 Columns PLAIN ALL WOOD TOWERS IRON and STEEL TANKS. Louisiana Red Cypress Wood Tanks W. E. CALDWELL CO. 219 E. Main Street LOUISVILLE KY. U. S. A. fo Ma own interest. who deals in Arms and Ammunition or who shoots Ries prmss a( wild informadon. Just out. Odention Belentifie American.) BE ALIVE and send for one FREE to ail countr1 ea Bend stamps for vamp ACETYLENE GAS AND CARBIDE OF 1004 1007 1012 1014 1015 1016 1022. SCIENTIFIC AMERICAN SUPPLE THE DURANT COUNTING MACHINES W. N. DURANT. Twelfth Edition Now Beady. THE SCIENTIFIC AMERICAN Price $ In Cloth ; $ In Sheep; $ In Half work has now Morocc Postpaid. been on the mar ket for nearly six years and thedemandforit has been so great that twelve edi tions have been called for. It is entirely distinctfrom the ordinary receipt book in being thoroughly up to date. The work may be regarded as the product of the studies and practical ex perience of the ablest chemists and workers in all parts of the world; the information given being of the highest convenient for ready use. Almost every inquiry that can be thought of. relating to formu'm used In the various manufacturing industries will here be found answered. Those who are engaged in almost any branch of industry will find in this book mu


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