History
The relay was invented in 1835 by American scientist Joseph Henry in order to improve his version of the electrical telegraph, developed earlier in 1831.
It is claimed that the English inventor Edward Davy "certainly invented the electric relay" in his electric telegraph c.1835.
A simple device, which we now call a relay, was included in the original 1840 telegraph patent of Samuel Morse. The mechanism described acted as a digital amplifier, repeating the telegraph signal, and thus allowing signals to be propagated as far as desired. This overcame the problem of limited range of earlier telegraphy schemes.
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