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 attachedto binding posts Nos. 1 and 2 are in circuitwith the Secondary Coil only. When atNos. 2 and 3 they receive the induced currentor extra current in the Primary."
Index. "Tesla coil, descriptive," shouldread "Tesla coil, disruptive."
iii
PREFACE TO THE SECOND EDITION.
The great favor with which the firstedition of this little work has been receivedand the steadily growing interest in itssubject, together with many valuable improvementsand researches, may be givenas the reasons for this new edition.
The book has been thoroughly revised,partly rewritten, and considerable new matter,with twenty-six new illustrations, added.It has been brought up to date as far as electricalscience has gone.
To detail all that has been done is toogreat a task for a preface; we may brieflymention the following new matter:
Coils for gas and automobile engines;medical coils, concise directions for operationand repairs; new forms of contactbreakers, including electrolytic and mechaniivcal;gas-lighting apparatus; primary andsecondary batteries.
The chapter on X-Ray Apparatus hasbeen entirely rewritten, and is thoroughlypractical; and an entire chapter on WirelessTelegraphy has been added. In a book ofthis size it is not feasible to give specificdirections and full dimensions for the manufactureof all the apparatus described.Indeed, much of the latter must be adaptedto the particular purpose for which it is tobe utilized. Again, the same amount ofmaterial will not always produce the sameresults. A little closer winding, greaterpressure applied to the cooling wax of acondenser, and the output or capacity ofeither is changed.
Matters purely of design or taste are tobe governed by the creative facu