Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 384
depression of the key Kcauses a momentary kick of the right-hand relay armatureagainst its contact stud and connects the positive pole ofthe main battery B to the cable for an instant. When the SUBMARINE TELEGRAPHY 369 key comes to rest after each dot or dash signal the otherrelay armature shifts… … ~M Cable |l|lll|lhjHllll|l|ll Fig. 13. the receiver. The receiving device is a suspended-coilrelay which has no retractile springs and is free to respondto cable impulses. This system has been used for manyyears on the three Marseilles-Algiers cables (560 miles)belonging to the French government…
Telegraph
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