ALS in pencil, signed “Edison,” to his lab supervisor S.A. Moore, one lined page, 5 x 8, January 20, 1921. In full: “Moore - In Nov when we were doing bad plating etc the repairs on females were far less than now 40 repairs per female in Nov now about 100 Can it be the alcohol wash - I would like to see under microscope just what the defects are.” Paper has been deacidified to stop browning and deterioration. In very good condition, with overall toning, heavier along edges, a couple of staple holes and a couple of small edge chips. R&R COA.