👉 Electrotelegraphy is a method of transmitting electrical signals over long distances using electronic circuits and communication lines. It was invented in 1842 by American inventor James Clerk Maxwell, who used it to transmit information between ships and other vessels on the high seas. The basic concept is that an electric current flows through a conductor when a magnetic field is applied to it. The electrical signals are then transmitted over radio waves or other electromagnetic waves, which can be received back at the receiving end.
