Report of the commissioner of patents, for the year 1849
The annual report of the United States Patent Office for 1849, compiled under Commissioner Thomas Ewbank and printed for the House of Representatives in Washington in 1850, summarizing patents granted and including Abraham Lincoln's device for lifting vessels over shoals. Wood engravings run to bird wings and webbed feet studied as models for flight, alongside geometric diagrams with dotted construction lines and ruled hatching, useful for feather patterning, mechanical schematics, and dashed-line technical layout.
