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If it were attempted to offer here a detailed explanation of the varied and numerous operations of the quadruplex, this article would assume the proportions of a treatise.
Aside from the great value of the quadruplex, saving millions of dollars, for a share in which Edison received $30,000, the automatic itself is described as of considerable utility by Sir William Thomson in his juror report at the Centennial Exposition of 1876, recommending it for award.
At this juncture other schemes were fermenting in his brain; but the quadruplex engrossed him. "This problem was of most difficult and complicated kind, and I bent all my energies toward its solution. It required a peculiar effort of the mind, such as the imagining of eight different things moving simultaneously on a mental plane, without anything to demonstrate their efficiency."
But I had not before heard of triplex and quadruplex and other yet more highly complex Souls; and I questioned Kinjuro vainly in the hope of learning the authority for his beliefs. They were the beliefs of his fathers: that was all he knew. Like most Izumo folk, Kinjuro was a Buddhist as well as a Shintoist. As the former he belonged to the Zen-shu, as the latter to the Izumo- Taisha.
An idea of their complexity may be gathered from the following, which is quoted from American Telegraphy and Encyclopedia of the Telegraph, by William Maver, Jr.: "It may well be doubted whether in the whole range of applied electricity there occur such beautiful combinations, so quickly made, broken up, and others reformed, as in the operation of the Edison quadruplex.
EDISON'S work in stock printers and telegraphy had marked him as a rising man in the electrical art of the period but his invention of quadruplex telegraphy in 1874 was what brought him very prominently before the notice of the public.
Hence, the bar would remain non-magnetic. As the path to the quadruplex passes through the duplex, let us consider the Stearns system, after noting one other principle namely, that if more than one path is presented in which an electric current may complete its circuit, it divides in proportion to the resistance of each path.
Edison invented duplex telegraphy by which two messages could be sent over the same wire in the same direction at the same time. Later he succeeded in combining the two, which resulted in the quadruplex, by which four messages may be sent over one wire at one time.
It should be stated, however, that between the outline and the filling in of the details there was an enormous amount of hard work, study, patient plodding, and endless experiments before Edison finally perfected his quadruplex system in the year 1874.
This suited me, and I started in and succeeded in making such an instrument, which had in it the germ of my quadruplex now used throughout the world, permitting the despatch of four messages over one wire simultaneously. By the time I had succeeded in getting the apparatus to work, Ellsworth suddenly disappeared. Many years afterward I used this little device again for the same purpose.
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