Scottish scientist, inventor, and author (1781–1868) best known for his inventions and discoveries related to optics, including the kaleidoscope. ALS signed “D. Brewster,” one page both sides, 7.25 x 9, December 27, 1828. Letter to a gentleman, most likely his publisher. In part: “I have sent to you by today’s post the newspaper containing the advertisement of No. 19 of the Edi. Journal, which you would oblige me by sending to the Globe…As I begin a new series of the Journal after No. XX you would oblige me by letting me know as soon as you conveniently can if you have any objections to continue to publish it.” Mounted to a slightly larger bordering sheet. In very good condition, with intersecting folds (one horizontal fold passing through part of the signature), light scattered toning and soiling, and mounting remnants to reverse upper border. RR Auction COA.