. Deep borehole surveys and problems. Boring. 110 DEEP BOREHOLE SURVEYS AND PROBLEMS at a definite instant and drawing the same out. The immersion and extraction are effected by clockwork, which at the same time actuates the arrest of a magnetic needle. In Fig. 60 the casing may be screwed off into two parts a and h, and they are separated by a cross floor c. In the upper part are the motion apparatus and the immersion. FIT :^^p, Fig. 59. Fig. 60.—Meine's apparatus. body. The lower part is filled with an etching or coloring fluid. The clockwork E stands on plate P which is sup- ported on three
. Deep borehole surveys and problems. Boring. 110 DEEP BOREHOLE SURVEYS AND PROBLEMS at a definite instant and drawing the same out. The immersion and extraction are effected by clockwork, which at the same time actuates the arrest of a magnetic needle. In Fig. 60 the casing may be screwed off into two parts a and h, and they are separated by a cross floor c. In the upper part are the motion apparatus and the immersion. FIT :^^p, Fig. 59. Fig. 60.—Meine's apparatus. body. The lower part is filled with an etching or coloring fluid. The clockwork E stands on plate P which is sup- ported on three legs d, and on the upper cover plate of the clockwork a strap S carries a magnetic needle N. The spring of the clockwork moves a drive of three gear wheels i, ii and 12 and a toothed rack is which carries the immersion body. This arrangement causes the rack either to descend. 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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