[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 patent examiners and inventors. The pages are mechanical line drawings of sound-recording apparatus, with lettered parts and numbered figures keyed to specifications. Their crisp technical diagrams, cutaway views and exploded parts offer a designer clear examples of 19th-century engineering line work and labelled schematic layouts.

Phonograph · Patents

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