Morse-Vail Telegraph Key

Alfred Vail made this key, believed to be from the first Baltimore-Washington telegraph line, as an improvement on Samuel Morse's original transmitter. Vail helped Morse develop a practical system for sending and receiving coded electrical signals over a wire, which was successfully demonstrated in 1844.

Morse's telegraph marked the arrival of instant long-distance communication in America. The revolutionary technology excited the public imagination, inspiring predictions that the telegraph would bring about economic prosperity, national unity, and even world peace.

From National Museum of American History, released by the Smithsonian under CC0 through its Open Access programme. The Smithsonian does not endorse ModelsXi. Its own page has the object record and other copies, including full-resolution and print-ready files where they exist. The file is measured in millimetres, so engines that expect metres will show it 1,000 times too large; the size above is the real one.