This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier:
4531643Full Citation: Utility Patent 34,730; Drawing of Improvements in Breech-Loading Repeating Cannon; 7/29/1862; Utility Patent Drawings, 1837–1911; Records of the Patent and Trademark Office, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/drawing-of-improvements-in-breechloading-repeating-cannon, December 6, 2024]