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[M2.83L] [M2.83] 83
[drawing] lateral chapels daguerreotyped: It is connected with two
important works: the apse of St John and Paul: and
Measures of No 150. the panel mouldings of the Byzantines.
Pure shaft from r2 to base. 5 " 0 one side of shaft 2¼ in wide Its main idea is that of a bridge of solid stone from
r r2 vertical circa 7 wall to wall, with a chamfered edge to the arch: and a cornice above:
r s --- --- --- --- 1¾ the chamfer of the arch nearly as wide as
m n 1 " 7¾ its soffit; so falling on an octagonal abacus and an
m m2 3 " 4¾ octagonal shaft; the notch worked with a joint at the
n n2 2¾ (mn x 2 + nn2 should = mm2) head, and a lintel laid over; This general construction
n3 n4 1½ but m m2 is smaller is shown opposite, now for details.
o p 8½ 1st; the lintel: Section x y no 150 in some of the
q C 1 " 3 arches it is x2 y2 Under it is a great gaping joint.
n2 n5 (chamfer) 2 Then, fig 2 No 150 gives a. section down at apex of arch;
cusp depth 2½ from a to soffit, i.e. a long masonry joint, and b along
abacus side 3 side of shaft 2¼ dotted line b; t is the flat befoiled space; Then the
I presume the plan to be, for the work is old and rough; back of the archivolt is seen below it and is also the
the moulding to be an octagon with its side alternately section of the {vertical} side of the trefoil: which the
2½ and 2 in: 2½ the faces and sides, 2 the chamfers; more elaborate upper {horizontal} section dies upon the
falling on an equal abacus of 3 each side, while the moulding rude {square} moulding The central trefoil is managed or
face divides into two fillets above not much more than mismanaged in the same way: It varies much in the form
half its width. of its lobes. No 154 was traced on the most graceful I
could reach on its outer edge, the inner line is {just} in
its place by section and fig 3 No 150 was traced on one of
the corners 4 foils only it is wrong side outwards.
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[Version 0.05: May 2008]