U.S. Patent #90540
To view the full patent, jump to the U.S. Patent Office Web-site
A TIFF plug-in for your browser is required to view the patent image files at the U.S. Patent Office Web-site.
Reproduced here is the page of drawings for U.S. Patent #90540.
Inventor: Richard A. Hill, Washington, DC
Issue Date: May 25, 1869