Design for a Half-tone Engraving: How to Obtain a Patent, Copp & Co. Patent Attorneys, Washington, D.C.
1898 · Pen and black ink, brush and gouache, graphite on paper, laid down on brown board
14.9 × 23 cm (5 7/8 × 9 1/16 in.)
Cooper Hewitt, Smithsonian Design Museum