Floor Lowering
Tunnels can also be enlarged by lowering the floor.
Read more about this topic: Tunnel
Famous quotes containing the words floor and/or lowering:
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—Andrew Holleran (b. 1943)
“Science is a dynamic undertaking directed to lowering the degree of the empiricism involved in solving problems; or, if you prefer, science is a process of fabricating a web of interconnected concepts and conceptual schemes arising from experiments and observations and fruitful of further experiments and observations.”
—James Conant (1893–1978)