. Deep borehole surveys and problems. Boring. Plate III.—Koebrich's core orientation apparatus. V. Inside the cap are a clock and compass and the compass is arrested by the wing F of the clock U (Figs. 3, 4) moving clockwise, taking with it the lever arm h of the double- armed lever 1, 2, 3, (Fig. 5). In this way end 3 of the lever which is bent round engages the arresting spring / and frees it. This latter springs up and clamps the needle against the cover plate of the compass. A circular graduation about the axis of F is arranged so that the interval between. Please note that th
. Deep borehole surveys and problems. Boring. Plate III.—Koebrich's core orientation apparatus. V. Inside the cap are a clock and compass and the compass is arrested by the wing F of the clock U (Figs. 3, 4) moving clockwise, taking with it the lever arm h of the double- armed lever 1, 2, 3, (Fig. 5). In this way end 3 of the lever which is bent round engages the arresting spring / and frees it. This latter springs up and clamps the needle against the cover plate of the compass. A circular graduation about the axis of F is arranged so that the interval between. 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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