. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 135 compass housing are completely filled with warmed gela- tine and then adjusted into tube A which is filled with hot water to keep the gelatine fluid. Before reading, the latter is again taken out. The protection tube A' is screwed over tube A and the apparatus sent into the hole. The counter- balance sectors always permit a rotation of the internal. Figs. 81 and 82.—Bawden's apparatus. tube in such a manner that the pendulum can always play free. On the gelatine solidifying the pendulum and the needle are fixed in
. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 135 compass housing are completely filled with warmed gela- tine and then adjusted into tube A which is filled with hot water to keep the gelatine fluid. Before reading, the latter is again taken out. The protection tube A' is screwed over tube A and the apparatus sent into the hole. The counter- balance sectors always permit a rotation of the internal. Figs. 81 and 82.—Bawden's apparatus. tube in such a manner that the pendulum can always play free. On the gelatine solidifying the pendulum and the needle are fixed in their positions of rest and these are read aboveground. The apparatus of Bawden utilizes the principle of Mac- George's device as also does that of Cross, ^ which latter therefore need not be mentioned here. The Bawden 1 Denny, C, "Diamond Drilling," pp. 76 et seq., Crosby 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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