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Automatic Valve
Patent for an automatic valve that uses a lever to open and close quickly, with illustrations.
Date:
November 20, 1906
Creator:
Pinkerton, Henry S.
System:
The Portal to Texas History
Harrow.
Patent for a new and improved harrow. This design consists in "[t]he combination, with the revolving harrow-teeth and prong-wheels, of the centrally-hinged vibratory frame, carrying drag-hook teeth . . . [and] [t]he combination, with the harrow-frame . . . carrying the hook-teeth, of the pulley, chain, and lever" (lines 62-70).
Date:
March 20, 1883
Creator:
Lewis, Charles Patton
System:
The Portal to Texas History