[Graphophone patents]

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

A United States Patent Office collection of 1878 patent drawings, published in Washington by the Government Printing Office, recording mechanical designs for the graphophone, an early sound-recording device. The pictures are black-and-white line engravings of numbered figures with lettered reference keys, showing gears, cylinders, levers, and frames, which a designer could use as detailed period technical diagrams of mechanisms.

Phonograph · Patents

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