Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 326
Fig. 230.The thickness of the metal gene-ally used for roofing and sidingvaries from No. 24 to No. 16 gauge. By actual trial made by The … Fig. 231. Keystone Bridge Company it was found that corrugated iron No. 20, spanning 6 feet, began to give permanent deflection at a load of 30 lb. per square foot, and that ^7 \ /oT it collapsed with a load of 60 lb. per square foot. The distance -^^^^ -^^• between centers of purlins should,…
Architecture · Building · Carpentry
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