Examples from the Web for quadruplex
I had paid for all the experiments on the quadruplex and exhausted the money, and I was again in straits.
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.
Quadruplex telegraph, sending four messages over one wire at the same time—Edison, 1873.
For his quadruplex system, Mr. Edison utilized this fact in the construction of a rheostat or resistance box.
British Dictionary definitions for quadruplex
Word Origin for quadruplex
Word Origin and History for quadruplex
1875, in reference to telegraph systems in which four messages can be wired simultaneously, from quadru- + plex. In classical Latin, quadruplex meant "fourfold, quadruple," as a noun, "a fourfold amount."