Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 326
362 SHEET METAL WORK 1S3 more pleasing appearance, but the larger corrugations are stiffer andwill span a greater distance,thereby permitting the purlins to be furtherapart. … 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
Architecture · Building · Carpentry
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