4th order windows

See Plate XVI facing Works, 10.300 for an illustration of fourth order windows, and the comment at Works, 10.299f.

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 M. 47L there is also a diagram of the 5th order.

For a general account of the orders of arches see Door Book.Front pastedown; House Book 1.Front pastedown; and compare Works, 10.290ff and the Plate XIV facing Works, 10.290.

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