MORSE CODE, IN TELECOMMUNICATIONS A TELEGRAPH
CODE INVENTED BY THE AMERICAN ARTIST SAMUEL
MORSE, 1791-1872. THE CODE USES TWO DIGITS, USUALLY
REFERRED TO AS DOTS AND DASHES, AND CODE SYMBOLS ARE
MADE UP FROM COMBINATIONS OF THESE. THE MOST COM-
MONLY RECURRING LETTERS ARE GIVEN THE SIMPLEST SYMBOLS
IN THE INTERESTS OF ECONOMY OF TIME AND OPERATOR FATIGUE.
CONVENTIONALLY THE DURATION OF A DASH IS THREE TIMES
THE DURATION OF A DOT; THE SPACE BETWEEN DIGITS IN EACH
SYMBOL HAS THE DURATION OF A DOT; THE SPACE BETWEEN
LETTERS IN A WORD IS THREE TIMES THE DURATION OF A DOT; THE
SPACE BETWEEN WORDS IS FIVE TIMES THE DURATION OF A DOT.
FOR AURAL AND VISUAL TELEGRAPHY, USING SOUNDERS,
BUZZERS, LAMPS, ETC. SEE TELEGRAPH; HELIGRAPH;
MORSE SOUNDER. THE DOT AND DASH DIGITS AND ADHERED TO.
INCREASED SPEED CAN BE ACHIEVED IN ELECTRO-MECHANICAL
APPARATUS BY MAKING THE DASH EQUAL IN DURATION TO THE
DOTS AND DISTINGUISHING BETWEEN THEM BY SOME OTHER
MEANS; E.G. IN SIGNALLING OVER CABLES, POSITIVE AND NEGA-
TIVE PULSES ARE USED. OTHER CODES FIND USE IN
MODERN TELEGRAPHY FOR SPECIAL PURPOSES; SEE MURRAYCODE;
TELEPRINTER.

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