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Updated: May 22, 2025
The use of a wall-base slab is not essential, although it is the more accurate method of building, for in cases where it is desirable to economize labor, or from other causes, the slabs forming the first course may be made with a thicker base, and may be fixed by a deposition of concrete, which is allowed to set behind them.
Upon the top of the footings is generally laid a horizontal slab, called the wall-base slab, the special feature of which is that it enables the thickness of the wall to be gauged accurately, and also provides a fixing for the first course of slabs.
The supposition that the arches were added afterwards would explain why the westernmost of them cuts off the top of the arch over the door. That it is his can hardly be doubted. The moulding and slope at the top resemble those which characterize the wall-base throughout his work. Murray's Cathedrals, Pt. 1, p. 180.
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