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Improvement in Pile-Drivers.

Description: Patent for an improved pile-driver device which automates the release of the pile-driver hammer as well as including a perpendicular device which advances the device longitudinally as the work progresses.
Date: January 22, 1875
Creator: McDermott, Martin
Partner: UNT Libraries Government Documents Department

Improvements in Cotton-Gins

Description: Patent for improvement in the Cotton-Gin with moveable brushes. This object is designed to make the brushes on the cotton machine move closer to the saw when they become shortened from constant use. This will improve the quality of the machine like a brand new equipment.
Date: June 22, 1875
Creator: Koehl, William
Partner: UNT Libraries Government Documents Department

Improvement in Speed-Measures.

Description: Patent for a "means for indicating the degree of speed with which an engine or train of cars is passing over a rail-road, and for enabling an engineer to regulate the speed of his engine to conform to the 'time' enjoined by his table, so that he will run at an even degree of speed, and be required neither to 'slow down' to save his schedule nor quicken the pace of his engine to make up lost time." (Lines 15-23) Includes instructions and illustrations.
Date: June 22, 1875
Creator: Minton, Stephen F.
Partner: UNT Libraries Government Documents Department

[Letter from J. A. Nimmo to H. S. Moore, July 22, 1875]

Description: Letter from J. A. Nimmo to Henry Moore discussing farm crops and the weather as well as details about the "steam works" that Moore has requested. He also talks about a device that he is thinking of patenting and local news including ways to bring more immigrants to the area and the health of his family and others in the area.
Date: July 22, 1875
Creator: Nimmo, J. A.
Partner: UNT Libraries Special Collections
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