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[PB.26L] [PB.26] 26
[Porta della Carta] Tracery of Porta della Carta
[diagram] A B C It is evidently derived from
a common 4 foil tracery
only the cusp hollow
[diagram] D chamfered.
[diagrams] A B C Its sub- divisions
are shown by the
rough figure opposite
of which however the little shaded
bit has was carefully worked. to show how
rigorously the Italians adhered to their awkward
system of considering the tracery perfect in
int itself and cutting in upon it by
the arch line. Thus . in this porta della Carta
it will be well to draw the set of circles on
on each side. and to give a large figure filled
with the inner traceries . and then cut clean
through it by the line of arch. as at D opposite
So rigorously is this done that the commence
ment of the parting of the trefoil 4 foil roll
B. into its two forks is seen at x. and then
suddenly stopped by the archivolts
thus
[diagram]
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[Version 0.05: May 2008]