Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 257
circuits is utilized in practicefor different types of automatic block signalling, using 242 TELEGRAPH ENGINEERING normally-clear or normally-danger signals on single- ordouble-track steam and electric r^ads in connection withoverlap, non-overlap or preliminary-section systems. The appearances of… … Fig. 13. gers, each with front and back contacts; that shown in Fig.13 is a three-position mo tor-type relay also with 4 contact-ing fingers, the closing of one or the other sets of contactsbeing accomplished by a partial rotation of the motorarmature through the medium of an eccentric link. 6.…
Telegraph
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