One of two Ruhmkorff Coils made by Queen & Co. The output with about 650 Watts of current in the primary was a torrent of sparks 45 inches in length.

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

BY
H. S. NORRIE
(NORMAN H. SCHNEIDER)

SECOND EDITION, REVISED AND MUCH ENLARGED

NEW YORK:
SPON & CHAMBERLAIN, 12 Cortlandt St.

LONDON:
E. & F. N. SPON, Ltd., 125 Strand
1901

Entered, according to Act of Congress, in the year 1896
Re-entered for Copyright in 1901
By SPON & CHAMBERLAIN
in the office of the Librarian of Congress, Washington, D. C.

BURR PRINTING HOUSE,
NEW YORK, N. Y., U. S. A.


ERRATA.

Page 55. Should read, "Cords being attached to binding posts Nos. 1 and 2 are in circuit with the Secondary Coil only. When at Nos. 2 and 3 they receive the induced current or extra current in the Primary."

Index. "Tesla coil, descriptive," should read "Tesla coil, disruptive."