Chicago : Engineering and Contracting Pub. Co. · leaf 334
were placed inside the tail-piece, asmany rings being placed at each move as wererequired to fill in the distance covered by theadvance of the shield. The cants in each ringwere placed so as to break joints with thosein the preceding ring. Each ring was expand-ed to the full radius against the… … Fig. 4—Sketch Showing Timbering, Center Wall and Side Shield. preciation of plant, and distributive share ofgeneral expense. Shields.—A description of the side shields,the method of timbering back of the shields,and the water-proofing is given here, as thegeneral methods were the same on each…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
