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 162
w^r 222. Chimney Ladder—is made of f-inch-diameter barsbent the shape as shown, and placed in the wall of chimneywhen built. For easy climbing the rungs should be placed 12inches apart between centres and about 18 inches wide, andproject 6 inches from chimney. Where large chimneys are con-cerned… … 223. Corrugated Iron—is used for roofs, sides of bulk-heads, sides of buildings and sheds ; also for arches in floors ofbuildings. For roofs it is usually laid directly upon the purlins, andheld in position by clips of hoop iron, which encircle the purlinsand are placed about 12 inches apart. 144…
Building, Iron and steel
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