Architectural iron and steel, and its application in the construction of buildings ... specifications of ironwork ... tables selected expressly for this work ... by Wm. H. Birkmire (1905)
Birkmire, Wm. H. (William Harvey), 1860-1924 · New York, J. Wiley · leaf 97
more expensive stairway than any of the otherspreviously described, and is used only in cases of long flightsand heavy traffic. The wall strings can be constructed of castiron for any length of span if placed directly against walls, forthe reason that dowels or expansion bolts are used to tie… … 135. Treads and Risers.—Treads are generally made of slate, \\, if, if, and 2 inches thick, and risers of iron, \ and finch thick. Where stairs have little light and dependence isplaced upon skylights, the treads and risers are frequently STAIR WA YS. /9 made of cast iron perforated. Where a…
Building, Iron and steel
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