Archive image from page 52 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 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
Archive image from page 52 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 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, 1907.
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