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Jack.
Patent for a jack for lifting heavy loads on railroads, which has an automatic steady movement of the load up and down without adjusting the jack settings.
Date:
August 6, 1907
Creator:
Blake, David Alexander & Blake, Charles William
Object Type:
Patent
System:
The Portal to Texas History
United States Earthquakes, 1931
Report discussing earthquake activity in the United States during 1931. The report is broken down by regions and has sections for specific earthquakes.
Date:
1932
Creator:
Neumann, Frank
Object Type:
Report
System:
The UNT Digital Library