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

THOMAS A. EDISON Pioneer Electrical Investigator and Inventor of Numerous Telegraph, Telephone, Lighting, and Other Electrical Devices.
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
COPYRIGHT, 1911, 1912, BY AMERICAN SCHOOL OF CORRESPONDENCE COPYRIGHT, 1911, 1912 BY AMERICAN TECHNICAL SOCIETY Entered at Stationers' Hall, London All Rights Reserved
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.