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[M.143L] [M.143]
No 115. San Giov & Paolo. Tombs. Traceries. 143
No 115. is the leaf plinth of the nameless tomb. described at p 52
of M.2: in St John & 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 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.
Traceries Principal 4foil Tracery Let the two circles in the
4foil opposite figure be given: To complete the arches between
General 1st with a radius = span of arch
Plan Join centres C C2. let fall Cq C2b perpendiculars.
Make pq = CC2: with cent C and dist Cq; desc.
circle qb: cutting C2 p in p b 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 / 3 Find a c = 2 a b / 3: draw c d
vertical. Make pc2 = a c from cent c describe c2
d cutting c d in d. draw e f horizontal: then
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[Version 0.05: May 2008]