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Rotary Engine.

Description: Patent for an improved, simple, and effective rotary engine that economically uses steam and automatically controls steam discharge. "Two distinct rotary motions in reverse directions are obtained at the same time" (lines 16-18) in this engine.
Date: April 11, 1893
Creator: Walker, James C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Extension-Brace for Ladders.

Description: Patent for an extension brace for ladders that improves on the inventor's previous patent (No. 416,413). The invention's parts "are positively raised and lowered by means of direct acting mechanism which is so constructed and arranged as to obtain the most beneficial results from a comparatively small application of power, the parts being strong and durable easily operated and readily understood" (lines 20-26).
Date: April 11, 1893
Creator: Crews, Dayton H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Compensating Pump-Spring.

Description: Patent for an improvement on the inventor's previous patent (No. 450,657). The improvements include getting rid of the sleeve, and "employ[ing] volute springs instead of the straight flat springs formerly used; [the inventor] also dispense[s] with the links and connect the inner ends of the springs to long pitmen which have a pivotal connection with the suction rod at a point above the springs; [the inventor] furthermore provide[s] a means for adjusting the tension of the springs without alteri… more
Date: April 11, 1893
Creator: Black, William L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Carpenter's Tool.

Description: Patent for carpenter's tool that has an "adjustable pattern" that can assist in "determining the exact size and configuration of the space in which a stair tread or riser is adapted to be fitted" (lines 9 - 12).
Date: February 11, 1919
Creator: McDermett, Jim E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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