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…
Building, Iron and steel
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