The electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for human-to-human transmission of coded text messages over wire. The electrical telegraph replaced such optical telegraphy systems as those designed by Claude Chappe for the French military, and Friedrich Clemens Gerke for the Prussian military.
From early studies of electricity, electrical phenomena were known to travel with great speed...
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The electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for human-to-human transmission of coded text messages over wire. The electrical telegraph replaced such optical telegraphy systems as those designed by Claude Chappe for the French military, and Friedrich Clemens Gerke for the Prussian military.
From early studies of electricity, electrical phenomena were known to travel with great speed, and many experimenters worked on the application of electricity to communications at a distance.
All the known effects of electricity - such as sparks, electrostatic attraction, chemical changes, electric shocks, and in later more advanced studies, electromagnetism - were applied by various people to the problems of detecting controlled transmissions of electricity at various distances.
In 1746 the French scientist and abbé Jean-Antoine Nollet gathered about two hundred monks into a circle about a mile (1.6 km) in circumference, with pieces...
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