Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 250
the safe loadmay be taken at 11,000 per square inch; with a factor of safety of 4,at 8,000 pounds; with a factor of safety of 5, at 6,500 pounds; andthat for common and usual purposes 10,000 pounds per square inchis a safe load. At present there ar6 few wrought-iron columnsmanufactured; they are… … =^ 234 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. served above, the common and usual safe load on iron is 10,000 pounds per square inch,that on steel is 12,000 pounds. For struts, angle irons, or a combination of them forming an angle or cross (Figs. 441 and 442), with or without separators, are…
Mechanical drawing
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