AN AMERICAN BOOK.

INDUCTION COILS and COIL MAKING.
Second edition thoroughly revised, greatly enlarged and brought up to latest American Practice,
By H. S. NORRIE,
(NORMAN H. SCHNEIDER)

Considerable space in the new matter is given to the following: Medical and bath coils, gas engine and spark coils, contact breakers, primary and secondary batteries; electric gas lighting; new method of X-ray work, etc. A complete chapter on up-to-date wireless telegraphy; a number of new tables and 25 original illustrations. Great care has been given to the revision to make this book the best American work on the subject. A very complete index, contents, list of illustrations and contents of tables have been added.

Contents of Chapters.

1. Construction of coils; sizes of wire; winding; testing; insulation; general remarks; medical and spark coils. 2. Contact breakers. 3. Insulation and cements. 4. Construction of condensers. 5. Experiments. 6. Spectrum analysis. 7. Currents in vacuo; air pumps. 8. Rotating effects. 9. Electric gas lighting; in multiple; in series. 10. Primary batteries for coils; varieties; open circuit cells; closed circuit cells; solutions. 11. Storage or secondary batteries; construction; setting up; charging. 12. Tesla and Hertz effects. 13. Roentgen Radiography. 14. Wireless telegraphy; arrangement of circuits of coil and coherer for sending and receiving messages; coherers; translating devices; air conductors; tables; contents; index.

XII + 270 Pages, 79 Illustrations, 5 × 6½ Inches.
Cloth. $1.00.


PRINCIPLES OF
ELECTRICAL POWER.
(CONTINUOUS CURRENT.)
FOR MECHANICAL ENGINEERS.
BY
A. H. BATE, A.M.I.E.E.

The rapid progress that has been made of late years in the application of electricity to industrial purposes, and particularly in the transmission of power by means of the electric motor, has made it imperative for every engineer who wishes to keep up to date to have some knowledge of the way electrical currents are controlled and used for practical purposes. This work is especially written for the practical engineer, mathematics being avoided.

Contents of Chapters.