This primary source comes from the Records of the Patent and Trademark Office, 1836 - 1978.
National Archives Identifier:
7451938Full Citation: Patent Drawing for T. A. Edison's Apparatus for Exhibiting Photographs of Moving Objects; 3/14/1893; Utility Patent Number 493426; Utility Patent Drawings, 1837 - 1911; Records of the Patent and Trademark Office, 1836 - 1978, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/patent-drawing-for-t-a-edisons-apparatus-for-exhibiting-photographs-of-moving-objects, March 28, 2024]