[Illustration: 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_
[Illustration: Colophon]
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_."
PREFACE TO THE SECOND EDITION.
The great favor with which the first edition of this little work
has been received and the steadily growing interest in its subject,
together with many valuable improvements and researches, may be given
as 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 electrical science has gone.
To detail all that has been done is too great a task for a preface; we
may briefly mention the following new matter:
Coils for gas and automobile engines; medical coils, concise directions
for operation and repairs; new forms of contact breakers, including
electrolytic and mechanical; gas-lighting apparatus; primary and
secondary batteries.
The chapter on X-Ray Apparatus has been entirely rewritten, and is
thoroughly practical; and an entire chapter on Wireless Telegraphy has
been added. In a book of this size it is not feasible to give specific
directions and full dimensions for the manufacture of all the apparatus
described. Indeed, much of the latter must be adapted to the particular
purpose for which it is to be utilized. Again, the same amount of
material will not always produce the same results. A little closer
winding, greater pressure applied to the cooling wax of a condenser,
and the output or capacity of either is changed.
Matters purely of design or taste are to be governed by the creative
faculty of the worker; but such general details and rules are given
as will be sufficient to enable one possessing ordinary constructive
ability to make his own apparatus.
The whole process of coil-making does not require high mechanical
skill, but chiefly patience and attention to details; and, perhaps best
of all, but few tools are needed, all of a simple kind.
We beg to acknowledge courtesies received from Messrs. Queen & Co., the
_Scientific American_ for frontispiece and Fig. 13, Mr. Goldingham's
book on Oil Engines for Fig. 12, and others who have been of assistance
to the author. The best American and English practice has been adopted;
the American standard gauges and sizes of wires are used, except where
noted.
A list of works, particularly of value to the coil worker, will be
found following the index.
H. S. NORRIE
(Norman H. Schneider.)
APRIL, 1901.
CONTENTS.
CHAPTER I.
COIL CONSTRUCTION.
Construction of Ruhmkorff Coils. Sizes of
Wires. Winding of Primary and Secondary.
Assembling. Connecting Up.
Insulation. Coils in Series. Oil Immersed
Coils. "Tesla" Coil. Disruptive
"Tesla" Coil. Coils for Gas
Engines. Spark Coils. Resistance
Coils. General Remarks on Coils. The
Testing of a Coil for Polarity. Failure
to Work. Medical Coils. Medical Coil
with Tube Regulation. Medical Coil
with Interchangeable Secondaries. Bath
Coils 1-64