[TABLE OF CONTENTS.]
The Perspective View.
Chronology of Leading Inventions of the Nineteenth Century.
The Electric Telegraph.
[The Voltaic Pile.] [Daniell’s Battery.] [Use of Conducting Wire by Weber.] [Steinheil Employs Earth as Return Circuit.] [Prof. Henry’s Electro-Magnet, and First Telegraphic Experiment.] [Prof. Morse’s Telegraphic Code and Register.] [First Line Between Washington and Baltimore.] [Bain’s Chemical Telegraph.] [Gintl’s Duplex Telegraph.] [Edison’s Quadruplex.] [House’s Printing Telegraph.] [Fac Simile Telegraphs.] [Channing and Farmer Fire Alarm.] [Telegraphing by Induction.] [Wireless Telegraphy by Marconi.] [Statistics.]