SOS
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SOS is a Morse code distress signal, used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line, to indicate that the Morse code equivalent
SOS was introduced for emergency maritime radio communication using Morse code.
Morse code
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Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. It is named after Samuel
SOS
…SOS is a Morse code distress signal ( ▄ ▄ ▄ ▄▄▄ ▄▄▄ ▄▄▄ ▄ ▄ ▄ ), used internationally, originally established for maritime use. In formal notation SOS is written with an…
This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur.
Single needle telegraph instrument
Telegraph key and sounder; the signal is "on" when the knob is pressed, and "off" when it is released, length and timing of the dits and dahs are entirely controlled by the telegraphist
Morse code receiver that records on paper tape