Shaft Lining
In North and South America, smaller shafts are designed to be rectangular with timber supports. Larger shafts are round and are concrete lined.
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Famous quotes containing the word shaft:
““It’s hard to tell you how I managed it.
When I saw the shaft had me by the coat,
I didn’t try too long to pull away,
Or fumble for my knife to cut away,
I just embraced the shaft and rode it out....””
—Robert Frost (1874–1963)