[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 19 pictures

A set of patent drawings issued by the United States Patent Office in Washington, D.C. in 1878, compiled as a record of early graphophone and phonograph inventions for patent examiners and inventors. The pictures are black-and-white mechanical line drawings of machine parts, shown in numbered figures with lettered reference marks, offering a designer clear, precise examples of nineteenth-century mechanical draughtsmanship and diagram layout.

Phonograph · Patents

Internet Archive · Smithsonian Libraries · Public domain (published before 1931) · More from this library