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7
91.
The window a is well placed under the window c, and the window
b is badly placed under the pier d, because this latter is
without support and foundation; mind therefore never to make a break
under the piers between the windows.
7
92.
OF THE SUPPORTS.
A pillar of which the thickness is increased will gain more than its
due strength, in direct proportion to what its loses in relative
height.
EXAMPLE.
If a pillar should be nine times as high as it is broad--that is to
say, if it is one braccio thick, according to rule it should be nine
braccia high--then, if you place 100 such pillars together in a mass
this will be ten braccia broad and 9 high; and if the first pillar
could carry 10000 pounds the second being only about as high as it
is wide, and thus lacking 8 parts of its proper length, it, that is
to say, each pillar thus united, will bear eight times more than
when disconnected; that is to say, that if at first it would carry
ten thousand pounds, it would now carry 90 thousand.
643
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