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.
In 1877, Thomas A. Edison was asked to update the section on the Telegraph for Appleton's Cyclopaedia of Applied Mechanics. At this point in his career, Edison was a respected telegraph inventor and former telegrapher.He submitted his article in the spring of 1878 when he was 31 and it was published in Appletons' 1880 edition.t this point in his career, Edison was a respected telegraph inventor and former telegrapher. He submitted his article in the spring of 1878 when he was 31 and it was published in Appletons' 1880 edition.