Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 131
an -effectual remedy led to the invention of systems ofmultiplex telegraphy, in which the same conductor might beused for the transmission and reception of more than one com-munication at the same time. Of these systems, the diplex is defined as a system whichpermits two messages to be transmitted…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-543-360.webp)
