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Improvement in Scew-Propellers.
Patent for "means for guiding pivoted propeller-blades so that they can open and close readily and uniformly. It also consists in a new mode of applying a spring there-to so that the obliquity or resistance of the blades will be automatically graduated." (Lines 6-11) Includes instructions and illustrations.
Date:
February 18, 1873
Creator:
Wilson, Martin M.
System:
The Portal to Texas History
Improvement in Combined Cultivator and Planter.
Patent for "a new and useful improvement in a combined corn and cotton planter and cultivator" (lines 3-6), includes instructions and illustrations.
Date:
December 18, 1877
Creator:
Skinner, Miles T.
System:
The Portal to Texas History