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in subjects: "vanes"  
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Improvement in Ventilators.

Description: Patent for improvement in ventilators which combines a bell-mouthed vane with white induction and black eduction pipes for the purpose of introducing fresh air and eliminating foul air from an enclosed area.
Date: December 21, 1875
Creator: Moyer, Alexander L.
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Partner: UNT Libraries Government Documents Department

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

Chimney-Cowl.

Description: Patent for an elbow-shaped chimney cowl that is simple yet durable, which may be attached to chimneys of various sizes. It It has a vane that enables the cowl to turn and send smoke in the direction the wind is blowing. It also has a screen to cover the opening, which will prevent large sparks or partially burned materials from exiting the chimney.
Date: December 5, 1911
Creator: Powell, John T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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