Electrical telegraph

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The electrical telegraph is a telegraph that uses electric signals. In general the term electrical telegraph refers to 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.

Types of electrical telegraphs[change | edit source]

Gauss-Weber telegraph and Carl Steinheil[change | edit source]

Carl Friedrich Gauss and Wilhelm Weber installed a 1000m long wire above the town's roofs. They were allowed to do this on 6 May 1833. Carl August Steinheil was able to build a telegraph network in 1835-6. He installed a telegraph line along the first German railroad in 1835.

Schilling telegraph[change | edit source]

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[change | edit source]

Dr. David Alter created it one year before the much more popular Morse telegraph was invented. Alter demonstrated it publically.

Morse telegraphs[change | edit source]

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.

The Americas' first telegram, transmitted via a repeater: "What hath God wrought" sent by Samuel F.B. Morse in 1844.

Other websites[change | edit source]