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Core-Drill.

Description: Patent for a core drill for making bore holes in rocks to get out solid samples of the inside of rocks, which has an improved grabbing method for retrieving the piece of rock inside the hole.
Date: August 3, 1909
Creator: McLoughlin, Malacha J. & Wynn, John S.
Partner: UNT Libraries Government Documents Department

Rock Drill.

Description: Patent for a new and improved rock-drill. This design "is to construct a simple and efficient rock-drill in which the forward feeding and rotating of the drill are accomplished automatically" (lines 15-18). It consists in "the drill-rod, a tappet-plate placed loosely on the drill-rod, clutch mechanism connected with the tappet-plate for engaging the drill-rod, a spring for impelling the drill-rod, a cam provided with conical ends for lifting the tappet-plate, and the guide" (lines 20-26).
Date: July 26, 1892
Creator: Belt, Perley P.
Partner: UNT Libraries Government Documents Department

Dry Separator

Description: Patent for a separator for mills designed to separate valuable material from extraneous material. Illustrations included.
Date: September 28, 1909
Creator: Snowden, Rene Ravenel
Partner: UNT Libraries Government Documents Department
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