The Multiple Telegraph: Invented By A. Graham Bell - Softcover

Alexander Graham Bell

Softcover

ISBN 10: 037170491X ISBN 13: 9780371704912

Publisher: HardPress, 2021

Synopsis

The Multiple Telegraph: Invented By A. Graham Bell by Alexander Graham Bell. This work presents Bell’s account of the invention of a system for sending many telegraphic signals simultaneously over a single wire, achieved by assigning different pitches and exploiting sympathetic vibrations and magnetically actuated circuits. The text traces Bell’s experiments in Boston and Salem during 1872–1875, from early piano-string and magnet setups to later steel plates, permanent magnets, vibrating armatures, and novel circuit breakers. It explains how a single battery could drive numerous transmitters, each tuned to a distinct pitch, with receivers calibrated to respond only to their corresponding note, and how a duplex arrangement could permit bidirectional communication. Bell also discusses the difficulties of timing, the use of condensers, dampers, and tuned inductors, and the concept of transmitting timbre and overtones. The history covers patent caveats, British interest and rejection, Gray and La Cour interferences, and Bell’s claim of priority before 1870 and practical demonstration by 1874–75. The document blends technical description with personal correspondence and sketches (Figs. 1–29) that framed the emergence of telephone concepts.

Edition details

• Publisher: HardPress
• Publication date: 2021
• Language: English
• ISBN 10: 037170491X
• ISBN 13: 9780371704912
• Binding: Paperback
• Number of pages: 38