[Graphophone patents]

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

A compilation of United States Patent Office patent drawings for graphophone and phonograph inventions, published in Washington, D.C. in 1878 for patent examiners, inventors and the public. The pictures are black-and-white mechanical line drawings of cylinders, diaphragms, gears, clamps and numbered parts with lead lines and figure labels, offering a designer clear schematic diagrams of early sound-recording machinery and technical drawing conventions.

Phonograph · Patents

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