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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

Improvement in Mold-Boards for Plows.

Description: Patent for an improved design for plow mold-boards that involves using holes and a water pump to keep the mold-board clear of earth.
Date: December 30, 1879
Creator: Fields, John W.
Partner: UNT Libraries Government Documents Department

Improvement in Air-Cooling Apparatus.

Description: Patent for "the construction and arrangement of a refrigerator for the purpose of cooling and maintaining a low and dry temperature, for preserving fresh meats and vegetables, and for cooling rooms for any purpose." (Lines 10-15) Includes instructions and illustrations.
Date: March 30, 1875
Creator: Hyatt, Frank A.
Partner: UNT Libraries Government Documents Department
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