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These documents consist of (1) a notebook from 1880 containing notes and drawings by John H. Vail of electrical connections for dynamos; (2) a notebook from 1891-1892 used by Frank A. Wardlaw for recording information about Edison standard dynamos and motors; and (3) diagrams from 1891-1893 pertaining to Edison arc lighting systems and Edison bi-polar motors. Courtesy of the Wichita State University Libraries.