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Adding-Machine

Description: Patent for adding machine that has improvements such as a controllable disk to avoid over or under rotation and simpler means of adding and removing adding disks.
Date: February 16, 1915
Creator: Sweet, William F. & Tideman, S.
Partner: UNT Libraries Government Documents Department

Air-Compressing Apparatus.

Description: Patent for a new air compressing apparatus which employs two kinds of tanks called high pressure containers and low pressure containers charged by means of an air compressing engine.
Date: March 16, 1915
Creator: Gebhardt, William Charles
Partner: UNT Libraries Government Documents Department

Double Stroke Pumping Jack

Description: Patent for a double-stroke pumping jack with two pistons in the same cylinder "to discharge a steady stream of water therefrom" (line 12-13). This invention allows the pipe cylinder and pistons to be easily removed for repairs or cleaning.
Date: March 16, 1915
Creator: Winterborne, William H.
Partner: UNT Libraries Government Documents Department

[Postcard to Mrs. F. Adler, July 16, 1915]

Description: Postcard to Mrs. F. Adler. The front of the postcard features a photograph of a man-made dam on a small lake, taken from down-stream. Trees surround the lake and dam on all sides, and there are large, rectangular stones piled up on the right side. A man in a light shirt and dark pants walks along the edge of the dam (where the water pours over the edge), going left.
Date: July 16, 1915
Partner: Patrick Heath Public Library