For the transmission of messages, there were already in ancient times simple systems for the optical transmission of messages with fire or smoke. These consisted of a few signals and were used for alerting.
With the increasing need for communication, these systems were no longer sufficient. The invention of the telescope made a wide range of signals possible.
- Systems with flags
- Flag alphabets of various navies – NATO, Royal Navy, German Kriegsmarine
- Signal alphabets with flags
- Wig Wag of the US Signal Corps
- Systems with poles
- Claude Chappe, France
- Prussian Telegraph
- Systems with flaps
- George Murray, England
- Abraham Niklas Edelcrantz, Sweden
- Ohlsen, Norway
With the discovery of electric current, there were new possibilities to transmit texts by the rash of needles. Well known were for example the needle telegraphs of
- Carl Friedrich Gauss and Wilhelm Weber
- Pual Ludwig Schilling von Canstatt
- William Fothergill Cooke and Charles Wheatstone
With the invention of the punched tape, further possibilities of data transmission but also storage arose, which were used in the so-called teleprinters. Known became the codes of
- Jean Maurice Emile Baudot
- Donald Murray
GC Wizard offers for the above mentioned systems besides symbol tables also functions for encrypting and decrypting.