216 BEEP BOREHOLE SURVEYS AND PROBLEMS 



wheel current, the take-up motor current, keys, etc. The 

 method has been frequently applied in measuring the devia- 

 tion of freezing shaft boreholes. The makers 

 claim the remarkable accuracy of about 1 in 2,000. 

 Anschiitz Borehole Deviation Instrument. — 

 Doctor Anschiitz^ employs the gyroscopic compass 

 for fixing the direction of deviation and a rigid 

 plumb bob for the amount of deviation. He 

 equips both with transmitting apparatus and 

 combines these with a receiving apparatus on the 

 surface so that one can read there at once the 

 position of the plumbing apparatus at any chosen 

 position in the borehole. The plumbing device is 

 let into the hole with a cable from which the depth 

 is read. 



Since the results are given directly on the merid- 

 ian, the astronomical north and the direction of 

 gravity the apparatus is free from partial measure- 

 ment errors. Each individual observation is com- 

 pletely independent of the others, thus obviating 

 the transference of errors. The superiority of this 

 method will thus be greater at greater depths. 

 Since an opening of the tube throughout the appli- 

 cation is not necessary, the dip measurer is always 

 ready for use and yields unvarying data. Figures 

 149 to 152 show the constructional parts of the 

 inclination measurer. They are made up of the 

 transmitter (Figs. 149-151) and the indicator or 

 receiver aboveground (Fig. 152). 



The Transmitter: Plumbing Cylinder and Chief 

 Parts. — This is shown in Fig. 149 as a pressure- 

 Fro 149 W^^^ ^t^^l cylinder a bearing a gyrocompass b 

 The trans- giving the direction, and a rigid plumb c with 

 ^^ ^^' Cardan suspension for giving the amount of incli- 

 nation of a borehole at any position. This cylinder has 

 steel feeler brushes d above and below and is let into the 



1 Haussmann, K., Gluckauf, July 4, p. 1076, 1914, also Bergassessor 

 WiMMELMANN, Kohle UTid Erz, Nos. 13-15, pp. 323-379, 1924. 



