[No. 21.—The S. & C. Series. Price 1/6 net.]

ELEMENTS OF
TELEPHONY

BY

ARTHUR CROTCH

Silver Medallist and Honoursman in Telegraphy, and Honoursman in Telephony, City and Guilds of London Institute, sometime Lecturer in these subjects at the Municipal Technical Schools, Norwich

With 51 Illustrations and 90 pages of Text


[No. 22.—The S. & C. Series. Price 1/6 net.]

THE GYROSCOPE
An Experimental Study