Century Dictionary and Cyclopedia
- Fourfold: applied to a system of telegraphy in which four messages may be transmitted simultaneously over one wire.
- n. An instrument by means of which four messages may be transmitted simultaneously over one wire.
- n. Sometimes abbreviated quad.
- To make quadruplex; arrange for fourfold transmission.
- adj. Having four components.
- adj. of or relating to a system in telegraphy by which four messages can be sent on one wire simultaneously.
- n. A quadruplex system
GNU Webster's 1913
- adj. Fourfold; folded or doubled twice.
- adj. having four units or components
- From Latin quadruplex ("fourfold, quadruple"), from quattuor ("four") + plico ("fold") (Wiktionary)
“The quadruplex was the tempting goal toward which Edison now constantly turned, and after more than a year's strenuous work he filed a number of applications for patents in the late summer of 1874.”
“Thus by combining instruments that respond only to variation in the strength of current from the distant station, with instruments that respond only to the change in the direction of current from the distant station, and by grouping a pair of these at each end of the line, the quadruplex is the result.”
“Note 32: The edition I will be using is that of 1624, Bibliotheca mundi Vincentii Burgundi … Speculum quadruplex, naturale, doctrinale, morale, historiale (Douai, Balthazar Bellerus).”
“Configured as a quadruplex, the apartment includes three bedrooms, four and a half bathrooms, 13-foot ceilings, a media room, library and private terrace.”
“At East 64th Street, Mr. Mottola's lavish quadruplex sits on one of the most exclusive-and expensive-blocks in Manhattan.”
“While the quadruplex apartment was rumored to have sold for more than $20 million, city records show that in September, Mr. Mottola sold his 11,000-square-foot condo for $13.8 million-well below its original stratospheric asking price of $34 million.”
“By 1976 it was estimated that 10,000 quadruplex VTRs had been sold worldwide.”
“Then there are the stock printer, the automatic repeating telegraph, quadruplex telegraphy, the phono-plex, the ore-milling process, the railway telegraph, the electric engine, the phonograph.”
“Then the lightning was introduced on the telegraph wires, and now we have the duplex and quadruplex instruments, by which any number of messages can be sent from opposite ends of the same wire at the same time, and they all appear to arrive at the front in good order.”
“-- One of the most remarkable of all the wonders of our age is what is known as duplex and quadruplex telegraphy.”
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