THE TELEPHONE, MICROPHONE, & PHONOGRAPH
Reading edition
THE TELEPHONE THE MICROPHONE & THE PHONOGRAPH
BY COUNT DU MONCEL MEMBRE DE L’INSTITUT
AUTHORISED TRANSLATION WITH ADDITIONS AND CORRECTIONS BY THE AUTHOR
WITH 70 ILLUSTRATIONS ON WOOD
FOURTH EDITION
LONDON KEGAN PAUL, TRENCH, TRÜBNER, & CO. Ltd. PATERNOSTER HOUSE, CHARING CROSS ROAD 1892
(The rights of translation and of reproduction are reserved)