One of my favorite record groups is RG 241: Records of the Patent and Trademark Office, because of the dazzling displays of ingenuity! These patents, as usual, do not disappoint. Enjoy!!
https://catalog.archives.gov/id/159160063RG 241: Restored Patent Drawings, 1836-1978. Patent 6558-X. J. Barron’s Patent Drawing for a Mechanical Fan. NAID: 159160063.RG 241: Utility Patent Drawings, 1837-1911. Patent 124,427. De Witt C. Farrington’s Improvement in Apparatus for Press Dyeing Stripes for Flags. NAID: 196019951.
For some other interesting reading about patents, check out these blog posts:
