Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 70
Fig. 8. … Fig. 9 shows one form of differentially-wound polarizedrelay. The armature is pivoted in a brass casing just 56 TELEGRAPH ENGINEERING below the upper end of the semicircular-shaped permanentmagnet and extends between the adjustable pole pieces ofthe electromagnet coils that are mounted on the other…
Telegraph
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