Electrical telegraph (nonfiction)

A printing electrical telegraph receiver, with transmitter key at bottom right.

An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via dedicated telecommunication lines or radio.

The electrical telegraph, or more commonly just telegraph, becoming the first form of electrical telecommunications, superseding optical semaphore telegraph systems.

In a matter of decades after their creation in the 1830's, electrical telegraph networks permitted people and commerce to transmit messages across both continents and oceans almost instantly, with widespread social and economic impacts.

Fiction cross-reference

• Crimes against mathematical constants
• Gnomon algorithm

Nonfiction cross-reference

• Electricity (nonfiction)
• Telephone switchboard (nonfiction)

External links:

• Electrical telegraph @ Wikipedia