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Improvement in Rotary Engines.

Description: Patent for rotary engines "driven by steam or other elastic agent, or which may be used for pumping water" (lines 29-32) to obtain "a more direct application of the force applied to drive the engine" (lines 39-40) including instructions and illustrations.
Date: February 6, 1872
Creator: Richardson, John Dun
Partner: UNT Libraries Government Documents Department

Improvement in Rotary Engines.

Description: Patent for an improved design of the rotary engine. Illustration included.
Date: February 6, 1877
Creator: Willson, Hodgen I.
Partner: UNT Libraries Government Documents Department

Improvement for Machines for Washing Photographs.

Description: Patent for an improved machine for washing photographic prints allowing metallic or other rigid plates to be washed in addition to flexible prints.
Date: February 6, 1877
Creator: Miller, Noah J.
Partner: UNT Libraries Government Documents Department

Improvement In Gin-Saw-Filing Machines.

Description: Patent for improved circular file for gin-file-machine.
Date: February 6, 1878
Creator: Eastham, Albert S.
Partner: UNT Libraries Government Documents Department
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