Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 23
the points a. In the foregoing figures relays and sounders were rep-resented as having a single core, while in reality they havetwo cores connected at the rear with a soft iron yoke.The windings on the two cores are usually connected inseries. This method of graphic representation will be re-tained… … Fig. 4. rubber knob at one end, and pivoted near the other end intrunnion screws that are mounted in uprights extendingfrom the elliptically-shaped brass base. The movementof the lever is adjustable by the knurled screw at its rearend. The other end of the lever is kept up normally bymeans of the…
Telegraph
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