american morse code การใช้

Initially, train dispatchers issued train orders using American Morse code over telegraph wires.
Most radio operators used the version of the Code that they were most familiar with the American Morse Code in the United States, and Continental Morse in Europe.
"' American Morse Code "' also known as Railroad Morse is the latter-day name for the original version of the Morse Code developed in the mid-1840s, by Samuel Morse and Alfred Vail for their electric telegraph.
The contacts could operate an audio oscillator for the study of International Morse Code ( used by radio ), or a sounder for the study of American Morse Code ( used by railroads ), or a light bulb ( Aldis Lamp-used by Navy ship to ship or by Heliograph ).
:The article " American Morse code " ( under History ) says the following : The first public message " What hath God wrought " was sent on May 24, 1844, by Morse in Washington to Alfred Vail at the B & O Railroad " outer depot " ( now the B & O railroad museum ) in Baltimore, Maryland.