. Deep borehole surveys and problems. Boring. CSI r:|- vD CO (a) (6) Fig. 19a and b.—The Sperry-Sun Well Surveying Co.'s model. the borehole width, is often resorted to, since it is rapid and cheap. It was evolved by the Parisian firm Entreprise generate de fongage de putts etudes et traveaux de mines ^ It is much appreciated in surveying freezing shaft holes and prospect holes. It^ consists of a receptacle or basket filled with lead and let down into the hole on a hawser. The basket A (Fig. 20) is slightly less in diameter than the hole. ^ Cavallier and Daxibine, Annates des mines, Paris, 190


. Deep borehole surveys and problems. Boring. CSI r:|- vD CO (a) (6) Fig. 19a and b.—The Sperry-Sun Well Surveying Co.'s model. the borehole width, is often resorted to, since it is rapid and cheap. It was evolved by the Parisian firm Entreprise generate de fongage de putts etudes et traveaux de mines ^ It is much appreciated in surveying freezing shaft holes and prospect holes. It^ consists of a receptacle or basket filled with lead and let down into the hole on a hawser. The basket A (Fig. 20) is slightly less in diameter than the hole. ^ Cavallier and Daxibine, Annates des mines, Paris, 1900. Series 9, Vol. 18, p. 392; Kohler, Bergbaukunde, Vol. 6, p. 634; Berg und Hutt. Ztg., p. 276, 1901. 2 Schmidt, Trans. Inst. Mining Eng., Vol. 52, No. 2, p. 178, 1917; Erlinghagen, Gluckauf, p. 705, June 8, 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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