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177 143
No 115. SAN GIOV AND PAOLO TOMBS TRACERIES
No 115. Is the leaf[n] plinth of the nameless tomb, described
at p 52 of M. 2. In St John and Paul: it is, (I think)
in the southern most chapel second from choir, on the
north wall. Its plinth is remarkable as a transition
from the Byzantine cutting to the luxuriant; very sharp
and fine in effect; and second lobe not yet
projecting though this is no real criterion of age.
since the second lobes project in early capitals[d] imitating Corinthian.
The three lines of the section give the plinth, the
fruit, flower, or long leaf, and the short leaf:
There is a central rib to each main lobe; and a ridge
between minor lobes.
Principal 4 foil Tracery Let the two circles in the
opposite figure be given: To complete the arches between
1st with a radius - span of arch
Join centres C C2 let fall Cq C2b perpendiculars.
Make pq - CC2: with cent C and dist Cq; desc. circle
qb: cutting C2b b Draw a b horizontal then a b is
abacus height, and the curves are struck from centres, a
and b.
2nd with radius - a b Find a c - 2 a b draw c d
3 3
vertical Make pc2 - a c fromcent c describe c 2 d cutting
c d in d. draw e f horizontal: then
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[Version 0.05: May 2008]