Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 569
soft iron, E, which servesas the keeper or armature of all the magnets. This arrangement,which is the Siemens cylindrical armature, is channelled longitu- 548 THE ELECTRIC LIGHT. dinally with two deep broad grooves, on opposite sides, best seenin fig. 850. A coil of fine insulated wire is wound… … Fig. 350. L, which turns upon its axis by means of the handle H above thedisk J. When the coil is turned half round on its vertical axis,the polarity of the armature is changed, and a dynamo-electriccurrent is induced in the armature coil in one direction, andupon turning it half a revolution…
Electrical engineering
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