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Water-power resources of the United States : distribution in horsepower per square mile.

Map shows state boundaries and statistics for each state. Includes text note and map key. Scale [ca. 1:20,000,000].

Date: 1919

Creator: Herog, W. B.

Item Type: Map

Partner: University of Texas at Arlington Library

Underground Portable Drill

Patent for drilling machines for the object of drilling underground openings for laying gas, electric, water or any other conduits. A second object is sectional drill or track worm to keep drilling going without moving the machine.

Date: July 15, 1919

Creator: Branning, Willie F.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

Device for Recovering Tools from Wells.

Patent for a device to lift and recover tools, such as drill-bits, that have been dropped or lost in wells. The device features two prongs that may be engaged to grip or secure in a "biting hold" (line 50) various objects, illustrations included.

Date: September 9, 1919

Creator: Scott, Augustus B.