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

by American School of Correspondence

ALBERT CUSHING CREHORE, A.B., Ph.D.

Electrical Engineer; Assistant Professor of Physics, Dartmouth College; Formerly instructor in Physics, Cornell University.
Author of "Synchronous and Other Multiple Telegraphs;" Joint Author of "Alternating Currents."

J. J. THOMSON, D.Sc, LL.D., Ph.D., F.R.S.

Fellow of Trinity College, Cambridge University; Cavendish Professor of Experimental Physics, Cambridge University.
Author of "The Conduction of Electricity through Gases," "Electricity and Matter."

FREDERICK BEDELL, Ph. D.

Professor of Applied Electricity, Cornell University.
Author of "The Principles of the Transformer;" Joint Author of "Alternating Currents."