Chicago : Engineering and Contracting Pub. Co. · leaf 361
y compass in a non-magnetic formation. Onereason for this seems to be that in loweringthe rods the joints work tight or loose becauseof the friction of the rods revolving in thehole. DAILY REPORTS. Figure 6 shows a report form filled out by,the drillmen every shift for the drill fore-man and the… … Fig. 5—Thermos Bottle Arrangement. with the idea of determining which are the1111 isi ec in nnical 1 lie ;e tests ha\ c shownthat the wearing quality of the stone dependsconsiderably upon the specific gravity andupon the structure. Although it is important to have the drill-nicn report the amount…
Buildings
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