In 1809 Samuel Thomas von Sömmerring designed an electrolytic relay as part of his electrochemical telegraph.
American scientist Joseph Henry is often claimed to have invented a relay in 1835 in order to improve his version of the electrical telegraph, developed earlier in 1831.
It is claimed that English inventor Edward Davy "certainly invented the electric relay" in his electric telegraph c.1835.
A simple device, which is now called 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.
The word relay appears in the context of electromagnetic operations from 1860.
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