COPYRIGHT, 1911, 1912,
BY
AMERICAN SCHOOL OF CORRESPONDENCE
COPYRIGHT, 1911, 1912
BY
AMERICAN TECHNICAL SOCIETY
Entered at Stationers' Hall, London
All Rights Reserved

[ToC]

Authors and Collaborators

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.

Head, Department of Electrical Engineering, University of Michigan