American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 55
es are termed alternating current machines. In others, and among themthose used for telegraphic purposes, the apparatus employed is such that the current*iuthe external circuit is in one direction. Machines of the latter class are termed con-tinuous, or direct current machines* The plan by which… … ing one end of the loops of the coil, the terminals of which are connected to curvedmetal segments a, a^ on the spindle of the coil; the segments being insulated from thesiiaft and from each other. Metal brushes b, b are caused to rest on the seg-ments, to which brushes the external conductors,…
Telegraph
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