Electrical telegraphs were point-to-point text messaging systems, primarily used from the 1840s until the late 20th century. It was the first electrical...

Morse. The electric telegraph was slower to develop in France due to the established optical telegraph system, but an electrical telegraph was put into use...

constructed. Half a century later, semaphore lines were replaced by the electrical telegraph, which was cheaper, faster, and more private. The line-of-sight distance...

A telegraph key or Morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system...

An electrical insulator is a material in which electric current does not flow freely. The atoms of the insulator have tightly bound electrons which cannot...

information technology professionals, especially electrical engineers. It began in 1871 as the Society of Telegraph Engineers. In 2006, it merged with the Institution...

Society of Telegraph Engineers in 1872, and was known under several titles over the years, such as Journal of the Institution of Electrical Engineers,...

commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is divided into a...

for telegraph wires and later for telephone wires. Because they are made of granite, the poles last indefinitely. On poles carrying both electrical and...

A telegraph sounder is an antique electromechanical device used as a receiver on electrical telegraph lines during the 19th century. It was invented by...