guidon (plural guidons) 1  A small pennant or banner carried by infantry soldiers to direct troop movement. 2  A soldier assigned to carry such a banner.
Within a year or two, Western Union and other telegraph companies were using diplex telegraphs on their busiest lines in major cities. In 1874, Thomas Edison invented the first quadruplex telegraph, which was capable of sending two messages simultaneously in each direction.ears later, quadruplex telegraphs were displaced by two new inventions, multiplex telegraphy capable of eight or more simultaneous transmissions, and the use of teletype machines, which did not require their operators to know Morse Code.
One very early experiment in electrical telegraphy was an electrochemical telegraph created by the German physician, anatomist, and inventor Samuel Thomas von Soemmering sÃ¶mmering in, 1809 based on an, earlier less robust design of 1804 By spanish polymath and Scientist Francisco Salva. campillo