Telegraph

William Cooke and Charles Wheatstone patent an electric telegraph in Britain in 1837. Samuel Morse develops his in the United States in the same decade, with a code of dots and dashes that wins. By the 1850s and 1860s, wires and then a transatlantic cable carry messages in minutes.

The contribution is information faster than any horse, ship, or train. Prices, orders, and news synchronize. The telephone puts a voice on the same kind of wire. The internet puts packets on a descendant of the same idea: a signal that outruns the mail.

A telegraph needs the battery or a generator, wire, and a code. It does not need a computer. It is the proof that a message can be electrical before anyone builds a switch that computes.

1837 is the patent year, not the first coast-to-coast line. The effect people mean when they say 'the telegraph' arrives over the following twenty years.