Chicago : Engineering and Contracting Pub. Co. · leaf 242
24 at El. —52 and the shaft bottom wasreached at El. —99.3 in 12 days working threeshifts each, as follows: Men-hoursMen- per-ft.Ay. No. Men. hours. of shaft. 2 foremen 276 5.87 1 timekeeper 26 0.55 6 miners 576 12.26 6 helpers 576 12.26 5+ top men 552 11.75 1— hoist engineer 284 6.04 1 fireman 228… … Rock Line At least I? Concretearound Thimble
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
