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

by American School of Correspondence

Assistant Examiner, United States Patent Office, Washington, D. C.

GEORGE R. METCALFE, M.E.

Editor, American Institute of Electrical Engineers
Formerly Head of Publication Department, Westinghouse Elec. & Mfg. Co.

J. P. SCHROETER

Graduate, Munich Technical School
Instructor in Electrical Engineering, American School of Correspondence

JAMES DIXON, E.E.

American Institute of Electrical Engineers