BATCHELOR, CHARLES.  British- born mechanical engineer who assisted Thomas Edison with some of his most important innovations in telegraphy, telephony and electric lighting. He kept a detailed record of their experiments: Charles Batchelor’s Recollections of Edison, the Edison Papers, Part II: Series Notes. Menlo Park Notebooks, 1878–1882. From The Papers of Thomas A. Edison: The Wizard of Menlo Park, 1878, edited by Paul B. Israel, Keith Nier, and Louis Carlat. Baltimore and London, Johns Hopkins University Press, 1999.