Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 398
hesections should besecurely keyed to-gether. 360. The BlawSteel Forms. TlieBlaw collapsiblesteel forms,as shownin Fig. 167, appearto be the only suc-cessful steel formsso far in general use.Fig. 167. Collapsible Steel Center or Form. There have been many attempts to devise steel centering for… … 327 310 MASONRY AND REINFORCED CONCRETE The Blaw collapsible steel centering is in general use for sewer and conduit construction. Thiscentering consists of one ormore steel plates about ^ inchthick and bent to the shaperequired by the interior of thesewer to be constructed. Thesteel plates are…
Architecture · Building
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