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 147
eiron-frame hoisting apparatus. This is composed of two 30-inch-diameter wheels //and C arranged on the cast-iron frameD, and worked by the crank / and 6-inch-diameter pinionwheel E, as shown in plan and elevation. 128 ARCHITECTURAL IRON AND STEEL. A heavy chain is used for raising the platform. It… … is thrown off the small shaft by the arm G; then a brake onwheel K worked by the lever arm L prevents any sudden fall-ing of the platform. The framework is 4 feet high by 3 feetlong by 22 inches wide. The crank arms extend 14 inches oneach side, beyond the width of fr^ame. In setting the framework…
Building, Iron and steel
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