quadruplex

[ kwod-roo-pleks, kwo-droo-pleks ]

/ ˈkwɒd rʊˌplɛks, kwɒˈdru plɛks /

fourfold; quadruple.

noting or pertaining to a system of telegraphy by which four messages may be transmitted simultaneously over one wire or communications channel.

Origin of quadruplex

From Latin, dating back to 1870–75; see origin at quadru-, -plex

I had paid for all the experiments on the quadruplex and exhausted the money, and I was again in straits.

Edison, His Life and Inventions |Frank Lewis Dyer and Thomas Commerford Martin
A general knowledge of the principles of quadruplex and multiplex working.

The British State Telegraphs |Hugo Richard Meyer
The first quadruplex system was invented by Edison in 1874, and in four years it saved more than half a million dollars.

The Story of Great Inventions |Elmer Ellsworth Burns
Quadruplex telegraph, sending four messages over one wire at the same time—Edison, 1873.

The Story of Great Inventions |Elmer Ellsworth Burns

For his quadruplex system, Mr. Edison utilized this fact in the construction of a rheostat or resistance box.

Edison, His Life and Inventions |Frank Lewis Dyer and Thomas Commerford Martin

quadruplex

/ (ˈkwɒdrʊˌplɛks, kwɒˈdruːplɛks) /

consisting of four parts; fourfold

denoting a type of television video tape recorder having four transversely rotating heads

quadruplicity (ˌkwɒdrʊˈplɪsɪtɪ), noun

C19: from Latin, from quadru- (see quadri-) + -plex -fold