THE TELEPHONE. A LECTURE
Reading edition
ENTITLED
RESEARCHES IN ELECTRIC TELEPHONY,
BY
PROFESSOR ALEXANDER GRAHAM BELL,
DELIVERED BEFORE
The Society of Telegraph Engineers,
October 31st, 1877.
PUBLISHED BY THE SOCIETY, AND EDITED BY LIEUT.-COL. FRANK BOLTON, C.E., Hon. Secretary, AND WILLIAM EDWARD LANGDON, Acting Secretary.
London: E. and F. N. SPON, 46, CHARING CROSS.
New York: 446, BROOME STREET. 1878.
Price One Shilling and Sixpence. The right of translation and reproduction is reserved