Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 66
Fig. 3. The connections of one station of a duplex circuit usingthis transmitter, are shoT\TL in Fig. 4, wherein T is thetransmitter, and j and k are the contact studs, the other DUPLEX TELEGRAPHY 51 letters ha\ing the same significance as before. The trans-mitter has an auxiliary spring lever,… … ^ G Fig. 4. study or with the stud k attached to the main lever. \Mienthe key is depressed the contact atj is made before that atk is broken, and when the key is released, the contact at kis made before that aty is broken. In this way the circuitfrom m to ground is always complete. The…
Telegraph
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