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Page 4 of 4
In this view we see the plan of Whitehall rotated 180 degrees, so that the pasted-in flap (bright red) is now at the top of the drawing in version (3).
Here we see the pasted-down flap in the upper right corner of the
illustration, with the passage under the degrees illustrated three dimensionally. With a 15 inch rise -- about the most that one is able to negotiate comfortably, especially in a full-length gown -- it is clear from the dimensions that there is adequate head-room.
The figure here further illustrates the clearance, as well as the relationship between stairs and passage.