Electrical telegraph
The electrical telegraph is a telegraph that uses electric signals. This is a signalling system where an operator makes and breaks an electrical contact with a telegraph key which results in an audible signal at the other end produced by a telegraph sounder which is interpreted and transcribed by a human operator.
Types of electrical telegraphs
Gauss-Weber telegraph and Carl Steinheil
Carl Friedrich Gauss and Wilhelm Weber installed a 1,200m long wire above the town of Göttingen's roofs. They were allowed to do this on 6 May 1833. Carl August Steinheil was able to build a telegraph network in 1835–1836. He installed a telegraph line along the first German railroad in 1835.
Schilling telegraph
The telegraph had a transmitting device which had a keyboard with 16 black-and-white keys. These served for switching the electric current.
Alter and the Elderton Telegraph
Dr. David Alter created it one year before the much more popular Morse telegraph was invented. Alter demonstrated it publicly.
Morse telegraphs
In the United States, the telegraph was developed by Samuel Morse and Alfred Vail. Morse created an electrical telegraph in 1837. His version was a design that could transmit over long distances using poor quality wire. Vail, his assistant, developed the Morse code signalling alphabet with Morse.
Electrical Telegraph Media
Cooke and Wheatstone's five-needle telegraph from 1837
Morse Telegraph (1837), historical collection of France Telecom, Telecommunication City in Pleumeur-Bodou, France.
Hughes telegraph, an early (1855) teleprinter built by Siemens and Halske
Sömmering's electric telegraph in 1809
Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816)
Pavel Schilling, an early pioneer of electrical telegraphy
Diagram of alphabet used in a 5-needle Cooke and Wheatstone Telegraph, indicating the letter G
Telegraph key and sounder
GWR Cooke and Wheatstone double needle telegraph instrument
A magneto-powered Wheatstone A. B. C. telegraph with the horizontal "communicator" dial, the inclined "indicator" dial and crank handle for the magneto that generated the electrical signal.
