By 'DR. DYKE' A. L. DYKE AUTO SUPPLY CO. Electrical Engineering and Experimental Work ot Every Description C. F. SPLITDORF The Nickel Plate Road between New York and Boston and Cleveland Fort Wayne and Chicago. face. If you were to assume that the Missis sippi River-or any other river flowing toward INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending April 18 1905 AND EACH BEARING THAT DATE ONE BILLION DOLLARS Genuine Jacques Anuneter $ postpaid Test your batteries. Reg Special catalog of voltme ters ammeters and com bination volt-ammeters
By 'DR. DYKE' A. L. DYKE AUTO SUPPLY CO. Electrical Engineering and Experimental Work ot Every Description C. F. SPLITDORF The Nickel Plate Road between New York and Boston and Cleveland Fort Wayne and Chicago. face. If you were to assume that the Missis sippi River-or any other river flowing toward INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending April 18 1905 AND EACH BEARING THAT DATE ONE BILLION DOLLARS Genuine Jacques Anuneter $ postpaid Test your batteries. Reg Special catalog of voltme ters ammeters and com bination volt-ammeters. SAVE MONEY on AUTO SUPPLIES The Whole Rafter before you POST& LESTER CO. Automobile and Marine ALEXANDER de CROUCH 40 So. Canal St. Chicag THE ELECTRICAL AGE 28 Cents a. Copy The Best Electrical Paper Published TUE ELECTRICAL AGE ON TIMELY TOPICS Price 10 Cents each by mail CAN SUPPLEMENT 1500. THE SHRINKAGE AND WARPING SUPPLEMENT 1500. ING OR. RECORDING TIN PLATE TIFIC AMERICAN SUPPLEMENT 1500. DIRECT-VISION SPECTROSCOPES. HOME MADE DYNAMOS. SCIENTIFIC PLATING DYNAMOS. SCIENTIFIC AME DYNAMO AND MOTOR COMBINED. SUPPLEMENTS 759 761 767 841. Price 10 Cents each by mail Order through your newsdealer or from MUNN ea COMPANY 361 Broadwa‘v New York IN FORCE LIFE INSURANCE THE PRUDENTIAL HAS THE STRENGTH OF GIBRALTAR That your belief in Life Insurance is honest. Sign that application today. The protection which you so much need can be found in JOHN F. DRYDEN President modern Gas=Engines ProducerzGas Plants By R. E. MATHOT 314 Pages Bound in Cloth 152 Illustrations Price $ Postpaid THE SUPPLEMENTARY - SPIRAL SPRING Absorbs all vibration. No jolts or rebounds. SUPPLEMENTARY SPIRAL SPRING CO. 4529 Delmar Ave. St. Louis Mo. A MONEY MAKER THE PETT YJOHN CO. We also manufacture Table Lamps Wall Lamps Chandeliers Street Lamps Etc. 100 Candle Power Wicks. No Smoke. No Odor. Absolutely safe. THEY SELL AT SIGHT. Chicago Solar Light Co. Dept 0 Chicago, scientific american, 1905-04-29
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