American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 58
reasesthe magnetism of the field magnets, and thus the magnetic field is increased. Thisstill further increases the current in the coils of the armature and, consequently, a cur-rent of greater strength flows in the field magnet coils, which in turn still further in-creases the magnetic field, and… … known as shunt-wound dynamos. In some machines the field magnets are excited byseparate machines, an instance of which will be given later. The essential parts of a dynamo machine are the field magnets, armature, com-mutator and brushes. These parts are shown in Fig. 23, which represents the…
Telegraph
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