[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.]