. Deep borehole surveys and problems. Boring. Fig. 11.—Horizontal borehole pressure recorder. (Burbach.) gage are pushed into the hole to the spot to be measured, the hole being full of rinsing water. Then on pulling the gage out and reading the highest pressure thereon the deviation from the horizontal can be calculated by consider- ing the specific gravity of the rinsing fluid. This latter, of course, is essential since water is not the only fluid; in potash mines magnesium chloride liquor is used. Borehole set horizontal. Atmospheres of Pressure Fig. —Horizontal borehole profile. Figur
. Deep borehole surveys and problems. Boring. Fig. 11.—Horizontal borehole pressure recorder. (Burbach.) gage are pushed into the hole to the spot to be measured, the hole being full of rinsing water. Then on pulling the gage out and reading the highest pressure thereon the deviation from the horizontal can be calculated by consider- ing the specific gravity of the rinsing fluid. This latter, of course, is essential since water is not the only fluid; in potash mines magnesium chloride liquor is used. Borehole set horizontal. Atmospheres of Pressure Fig. —Horizontal borehole profile. Figure 11a illustrates this simple principle, being an actual example from a German potash mine where a fluid of sp. gr. is being employed. To get the ordinate at the length 340 m., where the gage has registered atm. of pressure fall, proceed thus: 10 X = m. and similarly for the length 500 m. registering 4 atm. fall: 10 X 4 _^ __ -3^275-= m. h. When the borehole deviates upward, the pressure is read at each desired spot by sending in the gage on the rods. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Haddock, M. H. (Marshall Henry). New York, McGraw-Hill
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