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

A General Reference Work on
TELEPHONY, SUBSTATIONS, PARTY-LINE SYSTEMS, PROTECTION, MANUAL SWITCHBOARDS, AUTOMATIC SYSTEMS, POWER PLANTS, SPECIAL SERVICE FEATURES, CONSTRUCTION, ENGINEERING, OPERATION, MAINTENANCE, TELEGRAPHY, WIRELESS TELEGRAPHY AND TELEPHONY, ETC.
Prepared by a Corps of
TELEPHONE AND TELEGRAPH EXPERTS, AND ELECTRICAL ENGINEERS OF THE HIGHEST PROFESSIONAL STANDING
Illustrated with over Two Thousand Engravings
F O U R V O L U M E S
CHICAGO AMERICAN SCHOOL OF CORRESPONDENCE 1919

KEMPSTER B. MILLER. M.E.
Consulting Engineer and Telephone Expert Of the Firm of McMeen and Miller, Electrical Engineers and Patent Experts, Chicago American Institute of Electrical Engineers Western Society of Engineers
GEORGE W. PATTERSON, S.B., Ph.D.