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Waco Sheet
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:125000
Date:
1920
Creator:
United States. Army. Corps of Engineers.
Object Type:
Map
System:
The Portal to Texas History
Railway-Switch-Operating Mechanism
Patent for a railway operation switch which allows for the engineer of the train to operate the switch without the drawback of slowing the locomotive in question.
Date:
1920
Creator:
Tally, Carl E.
Object Type:
Patent
System:
The Portal to Texas History
Drag
Patent for a ground drag for "grading and removing refuse from the surface of the soil" (lines 10-12) that can be steered and that can gather and dispose of the dirt it levels off, including illustrations.
Date:
May 11, 1920
Creator:
Nelson, Charley E.
Object Type:
Patent
System:
The Portal to Texas History