Archive image from page 210 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 jniended Course ofHole_ ''Jy]'j.~iJ)r,r-Course265'?60' 200' of Hole 30 Z20°Acfual4m ''' 79794° ?92 293 29i°294'' 292' 293 P I d n Fig. 136.—Actual survey of a Portuguese borehole. typical borehole survey from Portugal constructed from such records. We are indebted to the proprietors of Engineering, and C. F. Casella & Co., London, the makers, Fig. 137. for the photographic views showing (Fig. 137) the compass and chnometer, (Fig. 138)

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Archive image from page 210 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 jniended Course ofHole_ ''Jy]'j.~iJ)r,r-Course265'?60' 200' of Hole 30 Z20°Acfual4m ''' 79794° ?92 293 29i°294'' 292' 293 P I d n Fig. 136.—Actual survey of a Portuguese borehole. typical borehole survey from Portugal constructed from such records. We are indebted to the proprietors of Engineering, and C. F. Casella & Co., London, the makers, Fig. 137. for the photographic views showing (Fig. 137) the compass and chnometer, (Fig. 138) the casing and inner parts ready for assembly and (Fig. 139) the clinometer and contact drum.

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Photo credit: © Bookive / Alamy / Afripics
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