[Graphophone patents]

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

A United States Patent Office compilation of graphophone patent drawings, published in Washington, D.C. in 1878 for inventors and patent examiners. The pictures are plain line diagrams of mechanical parts: gears, shafts, levers, and a bent tube with a horn-like mouthpiece, all in numbered callouts. A designer might take their precise technical linework and reference-numbered labels as a model for diagrammatic, engineering-style illustration.

Phonograph · Patents

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