Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 599
Fig. 1411. Fig. 1412. Fig. 1413. for its construction. It will follow the line of stair-nosing, and where there arechanges of pitch they are made to connect by curves tangent to these pitches,except where the landings are square, and newels set at the head of the land-
Mechanical drawing
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