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Approaches to New Orleans.

Description: Map shows union and confederate fortifications in the New Orleans area; swamps, roads, canals, and railroads; layout of the city of New Orleans; residents and landowners along some roads. Includes list of authorities. Relief shown by hachures. Scale [ca. 1:75,100].
Date: [1891..1895]
Creator: United States. Army. Corps of Engineers.
Partner: University of Texas at Arlington Library

Method of and Apparatus for Treating Mineral Pitch.

Description: Patent for an "improved method of and apparatus for treating mineral pitch and similar material to readily separate the asphalt and asphalt-oils from sand, bituminous rock, and other impurities contained in the mined material and removing the sand and impurities" (lines 12-17). The method circulates the material in hot water to separate the asphalt and asphalt-oils from the sand and impurities. The asphalt and oil rise to the top of the water and the impurities sink.
Date: November 5, 1895
Creator: Sellers, Harvey Lee; Conyngton, Hugh Ronald & Conyngton, Thomas
Partner: UNT Libraries Government Documents Department
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