DIAGRAM

There are some pencil measurements and a sketch to lower right on Notebook M2 p.86L, but they are hardly decipherable:
Diam 1 ½
Flat 7 ¾
dogt [?] 3 ¼
-----
13 ½ [sic]
[sketch of arches with disk in one spandrel]
[?] [?]
2 2
1 8
----
3 10

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[Version 0.05: May 2008]