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

by American School of Correspondence

DAVID P. MORETON, B.S., E.E.

Associate Professor of Electrical Engineering, Armour Institute of Technology
American Institute of Electrical Engineers

LEIGH S. KEITH, B.S.

Managing Engineer with McMeen and Miller, Electrical Engineers and Patent Experts Chicago
Associate Member, American Institute of Electrical Engineers

JESSIE M. SHEPHERD, A.B.

Associate Editor, Textbook Department, American School of Correspondence

ERNEST L. WALLACE, B.S.