Topic Page: Morse Code
n
1 a telegraph code formerly used internationally for transmitting messages; it was superseded by satellite technology (the Global Marine Distress and Safety System) in 1999. Letters, numbers, etc, are represented by groups of shorter dots and longer dashes, or by groups of the corresponding sounds, dits and dahs, the groups being separated by spaces Also called: international Morse code
[C19: named after Samuel Morse]
[for S. F. B. Morse], the arbitrary set of signals used on the telegraph (see code). It may also be used with a flash lamp for visible signaling. The international (or continental) Morse code is a simplified form generally used in radio telegraphy. The American Morse differs from the international Morse in 11 letters, in all the numerals except the numeral 4, and in the punctuation code. The unit of the code is the dot, representing a very brief depression of the telegraph key. The dash represents a depression lasting three times as long as a dot. Between the depressions there is a pause equal in time to one dot, except in a few letters and signs, when there is a wait of two dots. The pause between letters in a word lasts as long as one dash, between words it lasts as long as two dashes. The International Morse code is shown in the table entitled Morse Code. Morse code is now mainly used by amateur (ham) radio operators. The U.S. Coast Guard stopped monitoring Morse code transmissions in 1995 when their use in sending distress calls had been almost entirely superseded by automated systems using satellite relay.
Related Articles
Full text Article Morse, Samuel Finley Breese
(1791–1872) Samuel Finely Breese Morse was born in Charlestown, Massachusetts on 27 April 1791, the son of Jedidiah Morse, a Calvinist...
Full text Article Radio, Early Transmissions
In the transition from experiments to regular broadcasting, important pioneering efforts in radio transmission took place before the beginning of...
Full text Article Morse code
The code invented by Samuel Morse for transmitting telegraph messages. Each letter of the alphabet and number has a characteristic sequence...