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Water-Level.
Patent for an instrument to determine a level at widely distant points or determining inclinations and which may be correctly read under conditions where a level cannot be held erect. Also known as hydrostatic leveling, this instrument is comprised of flexibly connected liquid containers that are spaced apart at certain distances.
Date:
August 17, 1920
Creator:
Kaspar, John & Beran, Rud F.
System:
The Portal to Texas History