The Gramme dynamo was an electrical generator patented in 1870 by Belgian engineer Zénobe Gramme[?] (April 4, 1826 - January 20, 1901). The design, using a ring armature[?], was an improvement on earlier dynamos and helped usher in development of large-scale electrical devices. In 1873 it was discovered that the device could be reversed to serve as a motor.
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... 48.41% African American, 0.30% Native American, 3.41% Asian, 0.00% Pacific Islander, 4.15% from other races, and 3.73% from two or more races. 11.67% of the population ...