Prolific inventor and entrepreneur (1860-1930) most famous as co-inventor, with Herman Anschütz-Kaempfe of the gyrocompass. Ink signature, “Elmer A. Sperry,” on an off-white 6 x 7 sheet of his personal letterhead. In fine condition, with a mild shade of overall toning, and light wrinkling to left of signature. RRAuction COA.
