Chicago : Engineering and Contracting Pub. Co. · leaf 473
mestone boulders 8.0 Black slate 16.4 Coal, No. 5 seam 5.0 Fireclav and limestone boulders ...Slate (bottom of sump) 124.00129.00132.50136.50138.50144.50183.5018S.50190.70195.00206.00223.25228 25239.25249.25 Totaldepth tobottomof bed.… … Section Wrouph s4~B DeTai/ of Treat? ana fas^eningr Fig. 3—Steel Stairway in Shaft. sand and gravel strata, at which point thesteel shoe was landed on solid rock. The to-tal weight sunk to this point was 1,000 tons. The ventilating shaft, of circular-end de-sign with rectangular side walls,…
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Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
