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 95
w The treads to be cast iron, open-diamond pattern.Wooden treads are often used by securing them to the angleknee clippings {A) with carriage bolts. 76 ARCHITECTURAL IRON AND STEEL. 131. Circular Stairs—are used where circumstances pre-vent the construction of a straight staircase. The treads… … and secured to a 4 or 6 inch diameter wrought-iron pipeextending the full height of stairs. In adjusting the plan, it is important that the headroom STAIR IVA VS. 77 be sufficiently large to allow passage up and down: it shouldnot be less than 7 feet from top to bottom of treads. Thelanding, as…
Building, Iron and steel
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