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OF CRACKS IN WALLS, WHICH ARE WIDE AT THE BOTTOM AND NARROW AT THETOP AND OF
THEIR CAUSES.
The first and most important thing is stability.
THAT ARCH WILL
BE OF LONGER DURATION WHICH HAS A GOOD ABUTMENTOPPOSED TO ITS THRUST. HOW TO
PROGNOSTICATE THE CAUSES OF CRACKS IN ANY SORT OF WALL.
A new tower founded
partly on old masonry. III, 10a; they have there no explanatory text.
The walls
give way in cracks, some of which are more or lessvertical and others are
oblique. The first and most important thing is stability.
Peters at Rome,
provedhimself the greatest of modern architects. LXXX several sketches which
seem to me to have beensuggested by Bramantes dome of this church.
_ _Bramantes
name is incidentally mentioned in Leonardos manuscriptsin two passages (Nos.
ON
THE POSITION OF THE TIE IN THE ABOVE NAMED ARCH. The truncatedpart of the horns
must be as broad as it is high. To this it must be answered that this would be
a very poordevice, for three reasons.
CONCERNING ARCHITRAVES OF ONE OR SEVERAL
PIECES.
The adversary says that _a_ which projects, slips down.
OF ARCHED
CRACKS, WIDE AT THE TOP, AND NARROW BELOW. ON THE DAMAGE DONE TO THE POINTED
ARCH BY THROWING THE PRESSURE ONTHE FLANKS.
The cube shown above is better
shown here below. The stability of the arch built by an architect resides in
the tieand in the flanks.
WHAT IS THE LAW BY WHICH BUILDINGS HAVE
STABILITY.
Now we find among Leonardos studies of Cupolas on Plates LXXXIV
andLXXXV and in Pl. The walls give way in cracks, some of which are more or
lessvertical and others are oblique. In the original the drawing andwriting are
both in red chalk.
The truncatedpart of the horns must be as broad as it is
high.
One of the two columns on the right is similarto those employed by
Bramante at the Canonica di S.
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