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Ocher and Ochery Earths
Report about ocher or ochery earth, "a natural mineral pigment composed largely of clay permeated with hydrated iron (ferric oxide)" (p. 2). It includes information about the uses of choer, substitutes, artificial ocher, mining and local deposits, import and export of ocher, and related information.
Date:
May 1929
Creator:
Santmyers, R. M.
Object Type:
Report
System:
The UNT Digital Library
Pump for Hydraulic Presses
Patent for a hydraulic pump that drives at a uniform speed as the pressure of the press increases, and connects the pistons with two pairs of cylinders moving in opposite cycles.
Date:
May 10, 1921
Creator:
Henry, Nelson B.
Object Type:
Patent
System:
The Portal to Texas History