American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 371
turns will be 50. Placing this set of coils in multiple gives, say,two sets of coils, each with 250 turns and each now carrving .05 ampere (assuming that the reduced resistance of the coils inmultiple will not materially vary the line current), which gives 12.5 ampere turns for each coil and a… … WHEATSTONE AUTOMATIC TELEGRAPH. 3^9 To connect the coils ill multiple the binding posts i, 2 and 3, 4 are joined bymetal strips, as in Fig. 238. To connect in series the posts 2, 3, are joined, as in Fig.239. When connected in multiple the joint resistance of the coils is 50 ohms. Whenill series…
Telegraph
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