Cyclopedia of Telephony and Telegraphy, Vol. 1 / A General Reference Work on Telephony, etc. etc.

by American School of Correspondence

Professor of Physics, University of Chicago.
Joint Author of "A First Course in Physics," "Electricity, Sound and Light," etc.

KEMPSTER B. MILLER, M.E.

Consulting Engineer and Telephone Expert; of the Firm of McMeen and Miller,
Electrical Engineers and Patent Experts, Chicago.
Author of "American Telephone Practice."

WILLIAM H. PREECE

Chief of the British Postal Telegraph.
Joint Author of "Telegraphy," "A Manual of Telephony," etc.—

LOUIS BELL, Ph.D.