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Improvement in Windmills.

Description: Patent for an improved windmill, including illustrations, consisting of an arrangement of "three stationary sails between arms on central shaft, so as to obtain double or increased power from the air passing through the wheel." (lines 7-10)
Date: December 2, 1879
Creator: Dewees, Thomas
Partner: UNT Libraries Government Documents Department

Improvement in Molds for Sewer-Building.

Description: Patent for a collapsible mold on wheels, allowing a sewer to "be built in sections around the mold and the mold moved along the trench as sections are completed" (lines 13-16) including illustrations.
Date: December 23, 1879
Creator: Burns, James
Partner: UNT Libraries Government Documents Department
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