Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 117
New York and Chicagoare operated polar duplex between these terminal sta-tions, and are also simultaneously operated differentialduplex between New York and Buffalo. Such a circuitrequires repeating apparatus at Buffalo that is formed bycombining a direct-point duplex repeater with a quadru-plex… … Fig. II. a duplex-diplex system. One such system, devised byCrehore, utilizes both an alternating current and a directcurrent, these currents being separated by means of in-ductances and condensers. Fig. 11 shows the schematic QUADRUPLEX TELEGRAPHY 103 arrangement of apparatus at one station for an…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
