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Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .
Visual mnemonic charts have been devised over the ages. Baden-Powell included one in the Girl Guides handbook in 1918. A contemporary Morse code chart. Here is a more up-to-date version, ca. 1988: Other visual mnemonic systems have been created for Morse code, mapping the elements of the Morse code characters onto pictures for easy memorization.
American Morse code. 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 "American" qualifier was added because, after most of the rest of the world adopted " International Morse Code ...
Patricia Davies (née Owtram; born 19 June 1923) is an English former codebreaker who served as a special duties linguist in the Women’s Royal Naval Service during World War II. She and her younger sister Jean Argles are often referred to as "The Codebreaking Sisters". [1] As a teenage interceptor, Davies listened to radio transmissions in ...
The Voyager Golden Record contains 116 images and a variety of sounds. The items for the record, which is carried on both the Voyager 1 and Voyager 2 spacecraft, were selected for NASA by a committee chaired by Carl Sagan of Cornell University. Included are natural sounds (including some made by animals), musical selections from different ...
File:International Morse Code.svg. Size of this PNG preview of this SVG file: 414 × 530 pixels. Other resolutions: 187 × 240 pixels | 375 × 480 pixels | 600 × 768 pixels | 800 × 1,024 pixels | 1,600 × 2,048 pixels. Original file (SVG file, nominally 414 × 530 pixels, file size: 9 KB) This is a file from the Wikimedia Commons.
World War II cryptography. Cryptography was used extensively during World War II because of the importance of radio communication and the ease of radio interception. The nations involved fielded a plethora of code and cipher systems, many of the latter using rotor machines. As a result, the theoretical and practical aspects of cryptanalysis, or ...
Contents. File:Morse Code Mnemonic chart from Girl Guides handbook 1916.jpg. Size of this preview: 800 × 573 pixels. Other resolutions: 320 × 229 pixels | 640 × 458 pixels | 932 × 667 pixels. Original file (932 × 667 pixels, file size: 115 KB, MIME type: image/jpeg)