Chicago : Engineering and Contracting Pub. Co. · leaf 613
xil-iary bins in the shaft, in front of the orepockets below those levels where developmentwork only was being done, and where thedirt was mucked by hand. This gate provedto be satisfactory under the given condi-tions. In its construction, the curvature of thegate must be made an arc, the center of… … Fig. 7—Elevation of Bin Showing Arc Gate. equal to that of the swing, there is no pres-sure other than that of the ore normal tothe surface of the gate, producing only africtional resistance to opening. In none ofthe foregoing types has a forward step beenmade toward preventing the leakage around…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
