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Aeroplane.

Description: Patent for an aeroplane with a propeller, which is "pivotally mounted and adjustable into different positions relative to the planes in order to produce either a rising movement or thereof or a driving movement in a horizontal or other plane" (lines 26-30).
Date: September 19, 1911
Creator: Andrae, Ernest H.; Andrae, E. H.
Partner: UNT Libraries Government Documents Department

Surveying Instrument

Description: Patent for surveying instrument involved in leveling telescope equipment at more optimal pivot points.
Date: September 4, 1917
Creator: Clark, Franklin S.
Partner: UNT Libraries Government Documents Department
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