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CROWN.
ON THE DAMAGE DONE TO THE POINTED ARCH BY THROWING THE
PRESSURE ON
THE FLANKS.
An arch of small curve is safe in itself, but if it be heavily
charged, it is necessary to strengthen the flanks well. An arch of a
very large curve is weak in itself, and stronger if it be charged,
and will do little harm to its abutments, and its places of giving
way are o p.
[Footnote: Inside the large figure on the righi is the note: Da
pesare la forza dell' archo.]
7
81.
ON THE REMEDY FOR EARTHQUAKES.
The arch which throws its pressure perpendicularly on the abutments
will fulfil its function whatever be its direction, upside down,
sideways or upright.
The arch will not break if the chord of the outer arch does not
touch the inner arch. This is manifest by experience, because
whenever the chord a o n of the outer arch n r a approaches the
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