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

by American School of Correspondence

FRANCIS B. CROCKER, E.M., Ph.D.

Head, Department of Electrical Engineering, Columbia University
Past-President, American Institute of Electrical Engineers

MORTON ARENDT, E.E.

Instructor in Electrical Engineering, Columbia University, New York

EDWARD B. WAITE

Head, Instruction Department, American School of Correspondence
American Society of Mechanical Engineers
Western Society of Engineers