$ THE CURTIS DOUBLE CYLINDER MOTOR H. H. CURTIS MFG. CO. Hammondsport N. Y. Presses for BLAKE & JOHNSON P. 0. Box 7 WATERBURY CONN. 1015 Pine St St. Louis U. S. A. BALL BEARINCS 4-cycle Engines Boston Mass. THE OBER LATHES The Ober Mfg. Co. 10 Bell St Chagrin Falls O. GRINDER You Have a Telephone In Your Office Of Course New York Telephone Co. 15 Dey Street STRAICHT LECS The Alison Co. Dept. A 4 RECIPROCATING AUTOMATIC DRILL GOODELL-PRATT COMPANY. Greenfield Mass. WARREN'S OOPIN CENTRAL MANTEL CO. 1212 Olive St. ST. LOUIS STICK Joy. Write for booklet ' How to Shave' UNIVERSAL


$ THE CURTIS DOUBLE CYLINDER MOTOR H. H. CURTIS MFG. CO. Hammondsport N. Y. Presses for BLAKE & JOHNSON P. 0. Box 7 WATERBURY CONN. 1015 Pine St St. Louis U. S. A. BALL BEARINCS 4-cycle Engines Boston Mass. THE OBER LATHES The Ober Mfg. Co. 10 Bell St Chagrin Falls O. GRINDER You Have a Telephone In Your Office Of Course New York Telephone Co. 15 Dey Street STRAICHT LECS The Alison Co. Dept. A 4 RECIPROCATING AUTOMATIC DRILL GOODELL-PRATT COMPANY. Greenfield Mass. WARREN'S OOPIN CENTRAL MANTEL CO. 1212 Olive St. ST. LOUIS STICK Joy. Write for booklet ' How to Shave' UNIVERSAL KEROSENE ENGINE CO. 6 8 and 10 First St. New York TABER PUMP CO. 32 Wells St Buffalo. U. SA. Valuable Scientific Papers Price 10 cents each by mail ELECTRONS AND THE ELECTRO 1432 1433 1434. 1426 1427 1386. 1388 1389 1383 1381 1327. 1328 1329 1431. HOW TO CONSTRUCT AN EFFL. CIENT WIRELESS TELEGRAPH 1363. 1414 1415 1222 1223 THE INTERNAL WORK OF THE 1307 1308 1422 1400 1447 1370 51 1404 1405 1413 1455. THE WATERPROOFING OF FABRICS THE SPARK COIL ITS CONSTRVC. ELECTRIC IGNITERS FOR GAS EN An Automatic Pump Niagara Hydraulic Engine Co, scientific american, 05-09-09


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