. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . TF SO_ Send to our advertisers for their cataloguesand prices before buying. X=Ray Coils Telephone CoilsMedical Coils Spark Coils MAGNET WINDING OF EVERY DESCRIPTION C. F. SPLITDORF, i7-2t Vandewater St., New York. New Standard Oil, Gas and GasolineEngine Outfit ^jf^ Ifew Standard* Autoffas Dry Battery, - - - $ Jump Spark CoU, - - - - •* Insulated Cam-Contact Key, - - * Double
. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . TF SO_ Send to our advertisers for their cataloguesand prices before buying. X=Ray Coils Telephone CoilsMedical Coils Spark Coils MAGNET WINDING OF EVERY DESCRIPTION C. F. SPLITDORF, i7-2t Vandewater St., New York. New Standard Oil, Gas and GasolineEngine Outfit ^jf^ Ifew Standard* Autoffas Dry Battery, - - - $ Jump Spark CoU, - - - - •* Insulated Cam-Contact Key, - - * Double Porcelain Insulated Ignition Plug, If you are interested write for descriptive ROCHE. Inventor and Sole Mfr., 42 VESEY ST., NEW YORK CITY W« »ba BunnCketure oth*r good and useful ftppllknens to be operated with dry cells. GOOD BOOKS tbe Trench Polishers manual, fuU directions for polish-ing by a French Polisher. Paper, - 20 cts. Che K B. C* of Dynamo Design, by Alfred H. Avery,with drawings and illustrations. i2mo, cloth, 40cts. electric Batteries, l>ow to make ana Use Chem, by p. Marshall. i2mo, illustrated. Paper, - 25 cts. metal turning* Practical lessons in Metal handbook for young engineers and amateurs, byP. Marshall. Fully illustrated, cloth, - 80 cts. the B. B. €* Of electricity, by w. h. meadowcroft. Fully illustrated, i2mo, cloth, - - 50 cts. magnetism and e
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