ofexpense; but when the latter is not a serious consideration,fire-proof mills might be built upwards of 60 feet in widthwithout the introduction of a single column or any otherobstruction whatever. In large public buildings this may be effected with perfectease, and the beams so constrncted as to… … In a building of this description, the beams will each be 31feet 6 inches long, and 30 feet between the supports, and maybe composed of plates 22 inches deep, -^-^ thick, and .^-^^angle-iron 3 x 3 x -^ inch at bottom, and 4 x 4 x |- at top, [ \riveted on both sides, as shown in the section (fig.…
Building, Iron and steel
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