[Graphophone patents]

United States. Patent Office · 1878 · Washington, D.C., Govt. Print. Off. · 421 pictures

A bound set of United States Patent Office specifications for graphophone and phonograph mechanisms, printed by the Government Printing Office in Washington beginning in 1878 for inventors, examiners and manufacturers. Line-engraved drawings show sectional views of sound boxes, feed screws, gearing, springs and cylinder mandrels, numbered and lettered, offering hatched cutaways, mechanical diagrams and figure-label typography.

Phonograph · Patents

Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0 · More from this library