Signature.
This influential self-taught mathematician authored mathematical textbooks and also published and edited the "Mathematical Visitor" (1877-94) and "Mathematical Magazine" (1882-1913); after 1885 he was associated with the U.S. Coast and Geodetic Survey. Handsome large signature in brown ink, heavy stock 3 3/4" X 2ΒΌ" card, n.p., n.y. Near fine. Choice..... More