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Underground Ventilation at Butte (open access)

Underground Ventilation at Butte

From Introduction: "The officials of the North Butte mine we engage in making a study of ventilation problems before the coming of the investigators, so that opportunity was given to work with those officials for several months. This bulletin is a result of studies made from the data collected during the two and one-half years of study and observation above outlined."
Date: 1923
Creator: Harrington, Daniel
Object Type: Report
System: The UNT Digital Library
Mining and Preparing Domestic Graphite for Crucible Use (open access)

Mining and Preparing Domestic Graphite for Crucible Use

From Prefactory Statement: "In this bulletin are presented the results obtained in the first two phases of the work outlined above. The bulletin is in two parts. The first part describes the methods of mining and milling used, suggests a standard method of sampling finished graphite, and describes a rapid and convenient method of analysis developed at the Pittsburgh station of the Bureau of Mines, to which has been assigned the analytical and microscopic work. The second part describes experiments on the concentration and milling of graphite, which were made at the Salt Lake City, Utah, station."
Date: 1920
Creator: Dub, George D. & Moses, Frederick G.
Object Type: Report
System: The UNT Digital Library

[Mail-Express train in Pennsylvania]

One of the Pennsylvania Railroad's Mail-Express trains, headed by a K4s locomotive with a standard coach on the rear-end, rolls through the Pennsylvania countryside on a cold, dismal day in January 1923.
Date: January 1923
Creator: Newman-Schmidt
Object Type: Photograph
System: The Portal to Texas History