Patent model of a horse-powered machine. The model consists of two green metal ovals connects in the middle with three green metal brackets. A red metal track sits in grooves along the inside of the U-shaped pieces, creating a continuous loop.
Use
From 1790 to 1880, the US Patent Office required a three-dimensional working model to demonstrate each new invention.
Context
For patent number 2.83B, issued to A. W. Gray on October 26, 1842. Gray was a manufacturer of farm machinery in Middletown Springs, Vermont.
