American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 612
ill remains open, holding the disc atdanger. When, however, the last car of the trainpasses over the clear track instrument ct, itresumes its former position, opening the <urcuit atc again, whereupon a larger portion ot currenttraverses the magnet em, which is again magnetized,and attracts its…
Telegraph
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