 Morse code is a method of communication that relies on the transmitting of an alphabet constructed from dots and dashes.

 electrical pulses along a telegraph wire  an audio tone  as a radio signal with short and long pulses or tones  as a mechanical or visual signal e.g. a flashing light.

SSamual Morse invented Morse Code: ›1› Morse invented the electrical telegraph ›1› Morse finished his first working sample of the telegraph. ›1› Morse changed the telegraphic symbols, from a telegraphic dictionary with number code to a code for each letter. ›1› Morse sent the telegraph message "What hath God wrought" Washington, D.C. to his assistant, in Baltimore, Maryland.

 1890’s - Early radio communications  Navigational radio beacons  Continuous wave amateur radio operators.

 changes to eleven of the letters, was developed in Germany and eventually adopted as the worldwide standard as "International Morse".  The original code is now used only the United States and has became known as Railroad or American Morse code.