Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 598
Fig. 1409. Fig. 1410. horizontal lines through these points; or the same points may be determined byintersection of the projections of the plan with a single inclined line drawnalong the nosing of top and bottom steps. The number of treads is always oneless than the number of risers, the reason of…
Mechanical drawing
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