UNT Libraries Government Documents Department - 7 Matching Results

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Adding-Machine.

Patent for an adding-machine meant to "add fixed amounts of money received or to calculate the number of days a laborer has worked or the number of fractions of days" (lines 14-17). Mounted keys have mechanisms that rotate a ratchet wheel or disk. "Secured to the shaft upon which this ratchet wheel or disk is mounted is a rate-indicator, consisting of a disk divided off into radial sections, and also divided by lines running parallel to the circumference of said disk, dividing the same up into … more

Date: August 27, 1895

Creator: McElyea, James L.

Automatic Boiler-Feed

Patent for a steam boiler which automatically fills the boiler with water to the proper levels and keeps the levels steady.

Date: August 11, 1908

Creator: Twombly, Harry Denny

Casing Head

Patent for a Case-Head. This case-head is used in oil wells. Its purpose is to ensure a tight seal around a pipe so that gas can flow properly through the tube.

Date: August 10, 1918

Creator: Kinzbach, Frank

Core-Drill.

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.

Pump Controlling Means

Patent for a pump controlling means. This invention applies even pressures on the discharge line. Illustration included.

Date: August 23, 1904

Creator: Small, William

Stirrup

Patent for "new and useful improvements in stirrups" (lines 5-6), including illustration and instructions.

Date: August 17, 1909

Creator: Hooks, George W.

Wrench.

Patent for a new and improved wrench. This design "relates particularly to a combined pipe and nut wrench, and has for its object to provide a wrench of the class described which can be quickly changed to an ordinary wrench . . . [the] invention consists of a shank having a rigid jaw attached thereto, a movable jaw adjustable on the shank and an eccentrically-headed lever pivoted to the rear end of the movable jaw and bearing on the shank adapted to separate the rear end of the movable jaw and … more

Date: August 5, 1890