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SECOND RUPTURE OF THE ARCH.
If the excess of weight be placed in the middle of the arch at the
point a, that weight tends to fall towards b, and the arch
breaks at 2/3 of its height at c e; and g e is as many times
stronger than e a, as m o goes into m n.
ON ANOTHER CAUSE OF RUIN.
The arch will likewise give way under a transversal thrust, for when
the charge is not thrown directly on the foot of the arch, the arch
lasts but a short time.
7
80.
ON THE STRENGTH OF THE ARCH.
The way to give stability to the arch is to fill the spandrils with
good masonry up to the level of its summit.
ON THE LOADING OF ROUND ARCHES.
ON THE PROPER MANNER OF LOADING THE POINTED ARCH.
ON THE EVIL EFFECTS OF LOADING THE POINTED ARCH DIRECTLY ABOVE
ITS
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