Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 257
the nonpolarised relay and is in theright direction for the polarised one, henceboth act. It is thus possible, by means ofthese additions to the differential duplexcircuit, to send two sets of signals in eachdirection without interference. The bridgemethod of quadruplex telegraphy is also inuse,… … Quadruplex Telegraph System A, Polarised relay. B, Kon-polarised relay. C, Be-versing key. E, Earth. G, Galvanometer. B, Variableresistance. E, Increment key. are more constant than on land lines. It ispossible to increase the number of simulta-neous messages by extension of the bridgemethod; the…
Electrical engineering
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