Improvement in Double-Bitted Drills.
Description:
Patent for "an easy mode of straightening wells while drilling them through rock or earth, and also for enlarging the same into a cistern when it is desired to keep on hand a large supply of water." (Lines 8-13) Includes instructions and illustrations.
Date:
May 30, 1876
Creator:
Yarbrough, William H.
Partner:
UNT Libraries Government Documents Department