. Deep borehole surveys and problems. Boring. 142 DEEP BOREHOLE SURVEYS AND PROBLEMS some deep freezing shafts. Here contracts frequently stipulate a survey capable of registering a deviation of 1 in 200 or 1 off the vertical in every 200 deep. The normal range of this device is about 2 deg. from the vertical. It makes and maintains claims to simplicity, cheapness, lightness, rapidity and ability to survey narrow deep holes, giving a continuous record of amount and direction of dip. It was successfully employed at Seaham Colliery Sinkings. We are indebted to Professor Briggs for the following
. Deep borehole surveys and problems. Boring. 142 DEEP BOREHOLE SURVEYS AND PROBLEMS some deep freezing shafts. Here contracts frequently stipulate a survey capable of registering a deviation of 1 in 200 or 1 off the vertical in every 200 deep. The normal range of this device is about 2 deg. from the vertical. It makes and maintains claims to simplicity, cheapness, lightness, rapidity and ability to survey narrow deep holes, giving a continuous record of amount and direction of dip. It was successfully employed at Seaham Colliery Sinkings. We are indebted to Professor Briggs for the following details and personal notes. The Transmitter and Receiver.—The transmitter is hung in the hole on the rods and the receiver is situated near the mouth of the hole, the two electrically connected with a flexible five-strand Fig. 84.—Clinophone receiver. The transmitter^ has a plumb B (Plate IX) hung on a "G" violin string A connected to needle H through the wire wrapping of the string. The needle dips into a solu- tion (NaS04) F in the vulcanite cup E which has four platinum foil electrodes eNes, es and ew, 90 deg. apart (Fig. 8, Plate IX) each reaching to the cup base. These connect respectively to the rods Dn,De,Ds and Dw insulated from 1 See also Brydon, A. D., Trans. Inst. Min. Engr., Vol. 71, p. 431; Briggs, H., Proc. Roy. Soc, Vol. 46, p. 223, Edinburgh, 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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