Image of an American bald eagle above the United States Patent Office in Washington, D.C., on a letters patent certificate "No. 55158" issued to lithographer Louis Prang certifying he "invented a new and useful improvement in the manufacture of caustic alkali" dated May 29, 1866; official seal and ribbon at bottom left. "Drawn by A.A. Von Schmidt"--text, center left of certificate below image. "Engd. by W.H. Dougal"--text, center right of certificate below image.
Type
image
Extent
1 engraving : uncolored ; overall 50.17 x 37.78 cm (19 3/4 x 14 7/8 in.)
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