[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 18 pictures

This is a collection of United States patent drawings for graphophone and phonograph devices, published by the Patent Office in Washington, D.C. in 1878 for inventors, examiners and engineers. The pictures are black-and-white mechanical line drawings with lettered reference marks, showing cylinders, diaphragms, levers, gears and housings in plan, section and elevation views. A designer could draw on their precise technical diagram style, labelled callouts and layered cutaway views.

Phonograph · Patents

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