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Well Drill.

Description: Patent for a new and improved well drill. This design "consists in a novel construction of a tool for boring or drilling wells, which tool has the drill-bit and the reamer so united as to operate simultaneously, and thus serve the functions of the so-called "Z-bit" and effectually prevent the tool from being thrown laterally out of the line of cutting when striking bowlders; and the invention also consists in an improved construction of the coupling of the tool to the sinker-bar or drill-bar" (lines 9-18).
Date: July 17, 1888
Creator: Titus, Silas W. & Clark, Chester C.
Partner: UNT Libraries Government Documents Department

Rock Drill.

Description: Patent for a new and improved rock drill. This design consists in "the combination, with the bit having the inclined cutting-edge extending diagonally from one end to the other and the curved recesses formed in the sides of the bit, of the passage-ways or grooves at either end of said cutting-edge opening into the said recesses" (lines 64-70).
Date: December 28, 1886
Creator: Rader, Powell
Partner: UNT Libraries Government Documents Department

Well Drill.

Description: Patent for a new and improved well-drill. This design consists "[i]n a drill, the cylinder closed at its upper end by a head with a stuffing-box and a tapering opening and provided at its lower end with suitable cutters, in combination with an operating-rod passing through the upper head and a weight, said operating-rod being provided with spring-arms adapted to engage and raise said weight within the cylinder and at the top thereof automatically to release it" (lines 27-35).
Date: December 30, 1890
Creator: Welke, William Robert
Partner: UNT Libraries Government Documents Department

Ratchet-Drill

Description: Patent for adding mechanical improvements to ratchet drill tools. These improvements include improved adjustment efficiency and range.
Date: August 12, 1913
Creator: McMillan, Eugene C.
Partner: UNT Libraries Government Documents Department

Drill.

Description: Patent for a new and improved drill. This design consists in "the combination, with the main shaft carrying two bevel gear-wheels, of a shaft carrying a bevel gear-wheel adapted to be connected alternately with the two bevel gear-wheels on said main shaft, a pinion secured on the said shaft, and a disk provided with a bevel gear-wheel meshing in the said pinion, said disk being connected with the drilling-tool, so that the latter can move freely up and down, but is turned by the said disk" (lines 111-120).
Date: June 26, 1888
Creator: Godwin, John Calhoon.
Partner: UNT Libraries Government Documents Department

Drilling Tool for Wells.

Description: Patent for a new and improved drilling tool for wells. This design "relates to tools for drilling or boring Artesian, oil, and other deep wells; and it has for its object to prevent the loss of drill or auger or any portion of the drill-rods. With this end in view the invention consists in the improved means for connecting the tool to the lower end of the drill-rod" (lines 9-15).
Date: May 28, 1889
Creator: McLane, Hiram H.
Partner: UNT Libraries Government Documents Department

Dental Drill Attachment.

Description: Patent for a new and improved dental-drill attachment. This design consists in "the combination, with the upper pulley and the supporting pully-frame of a drill, of a rod having hinged to its upper end the clip, having the set-screw, and having at its lower end the frame, having the wheel and the side-spools journaled within it" (lines 25-31).
Date: August 13, 1889
Creator: Moyer, Jesse Hechler
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