Archive image from page 130 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 FLUID METHODS OF SURVEYING BOREHOLES 119 places where the magnetic needle would be useless. Such places are, of course, in iron fields and certain of the basic johfL n Fig. 66.—Specimen borehole surveys by the Kiruna method. igneous rocks. Moreover, good instrumental work can be done by the Kiruna method in holes of L4-in. diameter after due allowance for cohesion and capillarity has been

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