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Windmill.

Description: Patent for an improvement in the vertical wheel of windmills including illustrations.
Date: March 26, 1889
Creator: Dietert, Gustav
Partner: UNT Libraries Government Documents Department

Rack and Pinion Mechanism.

Description: Patent for a new and improved rack-and-pinion mechanism. This design "relates to improvements on rack-and-pinion mechanism to dispense with the connecting-rod on steam-engines, whereby a more equal, constant motive power at any point of the piston-stroke, and no dead or weak points of the same, will be obtained" (lines 9-14).
Date: October 22, 1889
Creator: MacDonald, Peter M.
Partner: UNT Libraries Government Documents Department