Autograph Letter Signed, to Miss Atwood, about dating and authenticating a letter by King George III. 1 page 7 x 4 inches, in good condition, the address panel pasted to verso. South Cottage, Queen’s Road, Kingston on Thames, 16 June 1864. Charles Knight (1791-1873), editor, author and publisher. In addition to being the editor and author of Penny Magazine and Penny Cyclopedia, and other popular works, Knight wrote The Results of Machinery (1831) and Knowledge is Power, which was published in 1855. In 1864 he withdrew from the business of publishing, but he continued to write nearly to the close of his long life, writing The Shadows of the Old Booksellers (1865), an autobiography under the title Passages of a Working Life during Half a Century (2 vols., 1864–1865), and an historical novel, Begg’d at Court (1867).