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. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 131 only dip in amount continuously and the second, though it gives both amount and bearing of dip, is intermittent. These are the only drawbacks to this clever device, which is independent of torsion in the rods or lowering rope. Boifom of Hole Surface of Ground. 4165 Esfimafed depfh of Reef veriiocilly below Mouth of Borehole Fig. 80. Mollmann's Apparatus.—This device,^ invented in Dort- mund in 1904, is an improvement on previous pendulum or plumb-bob apparatuses in that the vertical position 1 German Patent No. 155

. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 131 only dip in amount continuously and the second, though it gives both amount and bearing of dip, is intermittent. These are the only drawbacks to this clever device, which is independent of torsion in the rods or lowering rope. Boifom of Hole Surface of Ground. 4165 Esfimafed depfh of Reef veriiocilly below Mouth of Borehole Fig. 80. Mollmann's Apparatus.—This device,^ invented in Dort- mund in 1904, is an improvement on previous pendulum or plumb-bob apparatuses in that the vertical position 1 German Patent No. 155 Stock Photo
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The Book Worm / Alamy Stock Photo

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. Deep borehole surveys and problems. Boring. COMPASS AND PLUMB-BOB METHODS 131 only dip in amount continuously and the second, though it gives both amount and bearing of dip, is intermittent. These are the only drawbacks to this clever device, which is independent of torsion in the rods or lowering rope. Boifom of Hole Surface of Ground. 4165 Esfimafed depfh of Reef veriiocilly below Mouth of Borehole Fig. 80. Mollmann's Apparatus.—This device,^ invented in Dort- mund in 1904, is an improvement on previous pendulum or plumb-bob apparatuses in that the vertical position 1 German Patent No. 155,849, Oct. 22, 1904.. 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 work.. Haddock, M. H. (Marshall Henry). New York, McGraw-Hill

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