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Show i temperature. There would also be required re-quired at Intervals of two or three miles air-locks, as the pressure would Increase greatly as the deeper the shaft penetrated. pene-trated. To bore tQ creat depths the freezing; process would have to be employed, em-ployed, and a number of bore boles sunk in a circle around the shaft proper, so that py means of brine ths rock, sand and water could be froten and then excavated. ex-cavated. Harper's Weekly. TO EXPLORE THS . EARTH'S INTERIOR.- - - eSBBBBSSS-BBSBSF An Interesting discussion of the means to be employed In carrying- on a scientific scien-tific exploration of ths Interior, of the earth was given by Charles A Parsons, the Inventor of the steam-turbine, in a recent address before the British Association As-sociation for the Advancement of Science. Sci-ence. ' At present the earth Is penetrated penetrat-ed by shafts or bore boles to a point lightly In excess of a mils, and aavs for the Increase of temperature with depth but little la known of Its Interior condition. condi-tion. By sinking a shaft to great depth not only would vast scientific knowledge be gained, but also there would be ths possibility of discovering mineral conditions condi-tions of economic Importance. Mr.. Parsons Par-sons believes that sinking such ehafL would not be an impossible engineering accomplishment, and he has computed the approximate cost, length of time required re-quired and the temperature of the rock likely to be encountered aa follows: Depth from ths Time Temp, of Surface. Cost. In Years. Rock. 2 miles $i,500.000 10 123 Fahr. 4 miles 6.5U0.000 25 152 Fahr. f miles .. .... fl.OCOioo 40 182 Fahr. g miles 18.6OO.O0O B. 212 Fahr. 10 mi:es 18.500.000 70 242 Fahr. 12 miles 25,000.000 85 272 Fahr. The plan would be to sink the shaft tn some place free from water-jbearlng strata, providing stages at Intervals of a half mile, at each of which would be placed the machinery for working the section below, including the necessary refrigerating apparatus to reduce the |