Nut Lock.
Description:
Patent for a new and improved nut lock. This design "consists in a friction roller held loosely between two nuts, or between a nut and any object to be held by a bolt, which roller, when the nut or lock-nut is screwed down upon it, binds the nut or nuts upon the bolt and locks them securely thereon" (lines 11-16).
Date:
January 20, 1885
Creator:
Campbell, James A.
Partner:
UNT Libraries Government Documents Department