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For the 6th order, which is characterised by the finial above the point of the arch, see fig. 6e of Plate XIV facing Works, 10.290. For examples see Notebook M p.147, Notebook M p.148, and Notebook M p.207L.
At the top of Notebook M p.46 is what appears to be the first attempt to set out, in words and diagrams, the 1st order, 2nd order and 3rd order of Venetian arches. In the entry dated November 23rd at Notebook M p.47, with diagrams at Notebook M p.47L, the 1st order, 2nd order, 3rd order, and 4th order are described and illustrated in sequence, and at Notebook M p.47L there is also a diagram of the 5th order. The 6th order is not mentioned in these early analyses of the orders.
For a general account of the orders of arches see also Door Book.Front pastedown; House Book 1.Front pastedown and compare Works, 10.290ff and Plate XIV facing Works, 10.290.
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[Version 0.05: May 2008]