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

by American School of Correspondence

A. FREDERICK COLLINS

Editor, Collins Wireless Bulletin
Author of "Wireless Telegraphy, Its History, Theory, and Practice"

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