Morse code
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Morse code is a system for encoding letters and numbers as a sequence of "dots" and "dashes", consisting of short and long signals sent over some medium such as a telegraph wire or radio signal. It is named after telegraph pioneer Samuel Morse.
Resources
National Archives and Records Administration: INTERNATIONAL MORSE CODE, HAND SENDING, from the Department of Defense. Department of the Army. Office of the Chief Signal Officer. (09/18/1947 - 02/28/1964). ARC Identifier 36813 / Local Identifier 111-TF-3697. PRINCIPLES AND BASIC TECHNIQUE FOR GOOD, RHYTHMIC SENDING 0F MORSE CODE BY OPERATING THE HAND KEY.
