This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier:
6277781Full Citation: Patent Drawing for C. H. Alcoke's Roller Coasting Vehicle; 1/6/1885; Records of the Patent and Trademark Office, Record Group 241. [Online Version, https://www.docsteach.org/documents/document/patent-drawing-for-c-h-alcokes-roller-coasting-vehicle, April 27, 2024]