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.
Bell called his invention the multiple or harmonic telegraph. But up to the time he left Brantford for Boston, in April, 1871, the multiple telegraph was merely an idea. [237] After reaching Boston, Bell was busy instructing teachers how to teach deaf children to talk, and in teaching little deaf children himself.