Chicago : Engineering and Contracting Pub. Co. · leaf 392
completed May 13, 1910, boring singlelift. The cost of the hole was $1.43 a ft., asillows: Totals. Per ft. ibor $181.88 $0.3221 anagement 200.20 0.354i uel (coal and wood) 173.88 0.3070 Ight, oil, waste, etc 13.25 0.023 , lot 10.50 0.01S6 ravel 3.00 0.0053 umber 45.00 0.0797 ising pipe 10.00 0.0177… … Fig. 1. Sketch Showing Construction of aNew Patented Core Drill. ting edge of the bit. The new drill com-prises an outer barrel having an annular cut-ting bit on the end, and an inner barrel whichalso is provided with an annular cutting edge.The inner barrel is the core barrel and isarranged so as…
Buildings
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