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

by American School of Correspondence

LAWRENCE K. SAGER, S.B., M.P.L.

Patent Attorney and Electrical Expert
Formerly Assistant Examiner, U.S. Patent Office

GLENN M. HOBBS, Ph.D.

Secretary, American School of Correspondence
Formerly Instructor in Physics, University of Chicago
American Physical Society

CHARLES G. ASHLEY

Electrical Engineer and Expert in Wireless Telegraphy and Telephony