Building of all kinds of electrical machines, apparatus, coils, batteries, telephones, microphones, phonographs, novelties.
The articles are fully illustrated, principally with detail drawings to scale.
New Books, Notes and Queries, Workshop Notes and Hints, Tools and Supplies, etc.
ANNUAL SUBSCRIPTION, $1.50 POSTPAID
Send in your subscription and get your friends to subscribe. Unused postage stamps will be accepted (not revenue.) Address all communications to
SPON & CHAMBERLAIN,
12 Cortlandt Street, NEW YORK.
Induction Coils —AND— COIL MAKING.
Construction, Operation and Application.
By H. S. NORRIE.
Second edition, thoroughly revised and greatly enlarged, and including 25 new illustrations. A good deal of the new matter is devoted to Medical Coils, Bath Coils, Gas Engine and Spark Coils, Contact Breakers, Batteries, X-Ray Work, Electric Gas Lighting, and a chapter on Wireless Telegraphy.