Inventor (1906 - 1971) best known for inventing the first fully electronic television system. Signed book: Principia In Modern English. Later printing. California: University of California Press, 1947. Hardcover with dustjacket, 7.25 x 10.5, 680 pages. Signed on the first free end page, “Ex Libris P. T. Farnsworth 1951.” Some mild toning to inside pages, including signed page, Farnsworth’s bookplate affixed inside cover, and hinges a bit loose, otherwise fine condition. Dustjacket rates very good with scattered soiling, creasing, and chipping. RRAuction COA.