ww: James Buchanan Signed Patent for Improvement "In the Horse Power" of a Drive Shaft [American President] [Science & Technology]
Document signed "James Buchanan" as Secretary of State, and "Edmund Burke" as Commissioner of Patents; Washington, D.C., June 27, 1846, one page, vellum, with white paper Patent Office seal and ribbon. Includes a three page description of the invention, signed by the inventor, and with drawing of the invention.
