UNT Libraries Government Documents Department - 1 Matching Results
Search Results
- Spiral Ring.
- Patent for a new and improved lap-ring. This design consists in a "lap-ring for connecting the tree-irons of double-trees and single-trees, consisting of the S-shaped lap-ring having the end curves spread laterally from the stem of the S, and carried round on spiral curves to points ninety degrees beyond a line that would evenly divide the figure thus formed longitudinally" (lines 41-48).