Annual report of the Commissioner of Patents for the year 1869
This is an annual report of the United States Patent Office, published in Washington in 1876 for the year 1869, reproducing patent drawings for government and public record. The pages are dense grids of small engraved line diagrams of machinery, each captioned with a patent number and inventor's name. A designer could draw on the orderly labelled grid layout and the precise mechanical linework of tools, presses, and engines.
