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

by American School of Correspondence

ARTHUR CROTCH

Formerly Lecturer on Telegraphy and Telephony at the Municipal Technical Schools, Norwich, Eng.
Author of "Telegraphy and Telephony."

JAMES ERSKINE-MURRAY, D.Sc.

Fellow of the Royal Society of Edinburgh; Member of the Institution of Electrical Engineers.
Author of "A Handbook of Wireless Telegraphy."

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.