Archive image from page 210 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PHOTOGRAPHIC METHODS 199 as seen in Fig. 134d, where distances h, c and d are for records 2, 3 and 4, respectively. Similar reasoning applies to Fig. 135 showing clinometer records. Figure 136 shows a 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 suc

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Archive image from page 210 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PHOTOGRAPHIC METHODS 199 as seen in Fig. 134d, where distances h, c and d are for records 2, 3 and 4, respectively. Similar reasoning applies to Fig. 135 showing clinometer records. Figure 136 shows a 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,

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