Cyclopedia of Telephony and Telegraphy, Vol. 2 / A General Reference Work on Telephony, etc. etc.

by American School of Correspondence

A. H. McMILLAN, A.B., LL.B.

Author of "Telephone Law, A Manual on the Organization and Operation of Telephone Companies."

WILLIAM ESTY, S.B., M.A.

Head of Department of Electrical Engineering, Lehigh University.
Joint Author of "The Elements of Electrical Engineering."

GEORGE W. WILDER, Ph.D.

Formerly Professor of Telephone Engineering, Armour Institute of Technology.
Author of "Telephone Principles and Practice," "Simultaneous Telegraphy and Telephony," etc.

WILLIAM L. HOOPER, Ph.D.