. Deep borehole surveys and problems. Boring. CORE ORIENTATION 77 tional planes. In each of these, under the pressure of a spring, is a movable piston g on rods h carrying on their exterior ends hinged movable porcelain heads k. If the rod is moved outward by internal pressure these heads take a mold of the borehole walls. A compass n whose needle m is arrestable by the lever o actuated by the spring p is used for taking the strata strike. There is a piston con- nected to 0 which, as a result of the pressure of spring p, can. â ^ Fig. 41.âRapoport's device. close a duct leading to the channel
. Deep borehole surveys and problems. Boring. CORE ORIENTATION 77 tional planes. In each of these, under the pressure of a spring, is a movable piston g on rods h carrying on their exterior ends hinged movable porcelain heads k. If the rod is moved outward by internal pressure these heads take a mold of the borehole walls. A compass n whose needle m is arrestable by the lever o actuated by the spring p is used for taking the strata strike. There is a piston con- nected to 0 which, as a result of the pressure of spring p, can. â ^ Fig. 41.âRapoport's device. close a duct leading to the channel h. The piston is pressed up when a means of pressure appears in 6 and the needle is freed to take up its position. If before raising the appa- ratus out of the hole the pressure channel is closed, the piston g goes in first and then q is brought by the spring p to the original position, thus again locking the needle. Obviously very hard strata, and very friable strata too, make the application of the device, in its present form, useless; but, as said, we present the apparatus for its possi- ble use under suitable modifications. Florin's Method.âThis ingenious apparatus was in- vented by a chemist, Jean Florin, of Brussels in 1908^ and 1 Florin, J., Enregistrer rorientation des strates au fond des trous de sondage, Annates des mines de Belgique, Tome 13, p. 781, 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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