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So important an invention as the quadruplex could not long go begging, but there were many difficulties connected with its introduction, some of which are best described in Mr.
One of the great cases in which he thus took a leading and distinguished part was that of the quadruplex telegraph; and later he acted as legal adviser to Henry Villard in his numerous grandiose enterprises.
Edison states, however, that the automatic was finally adopted in England and used for many years; indeed, is still in use there. But they took whatever was needed from his system, and he "has never had a cent from them." Arduous work was at once resumed at home on duplex and quadruplex telegraphy, just as though there had been no intermission or discouragement over dots twenty-seven feet long.
Though Edison received comparatively little for this invention, its commercial value may be estimated from the statement by the president of the Western Union that it saved that company half a million dollars in a single year. Edison's quadruplex system was also adopted by the British lines.
Herein lay the germ of the Edison quadruplex. It is also noted that "In 1874 Edison invented a method of simultaneous transmission by induced currents, which has given very satisfactory results in experimental trials."
Edison followed up his work on the diplex and combined the two systems into the quadruplex, by means of which FOUR messages could be sent and received simultaneously over the one wire, two in each direction, thus employing eight operators four at each end two sending and two receiving.
Gould to secure an interest in the quadruplex, as a factor in his campaign against the Western Union, and as a decisive step toward his control of that system, by the subsequent merger that included not only the Atlantic & Pacific Telegraph Company, but the American Union Telegraph Company. Nor was Mr. Gould less appreciative of the value of Edison's automatic system.
I was paying a sheriff five dollars a day to withhold judgment which had been entered against me in a case which I had paid no attention to; and if the quadruplex had not worked before the president, I knew I was to have trouble and might lose my machinery. The New York Times came out next day with a full account.
Edison, it is impossible to mention more than these: "The quadruplex telegraph system for sending four messages two in each direction at the same time; the telephone carbon transmitter; the phonograph; the incandescent electric light and complete system; magnetic separator; Edison Effect now used in Radio bulbs; giant rock crushers; alkaline storage battery; motion picture camera.
The "duplex system," whereby two messages, one in either direction, can be sent over one wire simultaneously without interfering, and the quadruplex system, whereby four messages, two in either direction, are also sent at once, have come into use where the traffic over the lines is very great.
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