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178 144
TRACERIES GENERAL PLAB MOULDINGS
e f is the abacus height and the curves are struck
from d and its correspondent:
It is evident at a glance that this is a curve
never used perhaps intermediate fronts, maybe. This I
must ascertain if possible.
The general idea of the tracery being that of a
variously moulded cross on a square abacus let the cusps
and[m]rolls be fixed as ab c d e f g h opp. on a square
abacus from whose edge they are equidistant: Then there
is evidently every conceivable degree of depth in the
cavetto of the intermediate moulding: as first, d e
with the cavette shallow: the bend small, and a deep
interval between it and cusp: This I imagine the earliest
form 2nd g f cavetto deeper: and interval smaller 3rd
b c: deeper cavetto and interval gone. This is rare.
4th x h one side of bead mark in cusp a frequent form.
Then observe that in order that the disporportion may not
be so great between the great and smaller roll: in the
form d e; the larger roll ususlly is a little diminished
and the bead enlarged, while c b is in about true propor-
tion for c d
Understanding this, we may take as an instance first a
small house near the Teatro Mahdron, with an early
group of 4 foil
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[Version 0.05: May 2008]