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2007 Economic Census Map: Dallas-Fort Worth, Texas Combined Statistical Area
Map showing the area of the Dallas-Fort Worth, Texas Combined Statistical Area for which the U.S. Census Bureau collected data during the 2007 economic census.
Date:
2007
Creator:
United States. Bureau of the Census.
Object Type:
Map
System:
The Portal to Texas History
Water-Gage.
Patent for a water-gage measuring the height or volume of water in a steam boiler, particularly those "held closed by the weight of the operating handle" (lines 11-12). The device is designed for simple manufacture and easy assembly & disassembly without tools, and features a valve seat that stays in place, illustrations included.
Date:
December 30, 1919
Creator:
Leidecker, Helmoth M.
Object Type:
Patent
System:
The Portal to Texas History