. Deep borehole surveys and problems. Boring. 238 DEEP BOREHOLE SURVEYS AND PROBLEMS caused purposely, as by explosive charges, air and sound waves are set up and these are not surface earth waves. Air sound waves are distinctly indicated on the record for quakes due to human agency, and they are quite distinct from those movements and tremors of the earth due to earth waves. These are propagated much more slowly. I 2 3 4 5 6 16 Fig. 158a.âImpulse record. I ^ V ^S Speed of Recording Paper =One Inch Per Second of Time â Impulse record Fig. 158b.â{After Kithil.) Fig. 158. than deep earth waves;
. Deep borehole surveys and problems. Boring. 238 DEEP BOREHOLE SURVEYS AND PROBLEMS caused purposely, as by explosive charges, air and sound waves are set up and these are not surface earth waves. Air sound waves are distinctly indicated on the record for quakes due to human agency, and they are quite distinct from those movements and tremors of the earth due to earth waves. These are propagated much more slowly. I 2 3 4 5 6 16 Fig. 158a.âImpulse record. I ^ V ^S Speed of Recording Paper =One Inch Per Second of Time â Impulse record Fig. 158b.â{After Kithil.) Fig. 158. than deep earth waves; consequently, although they are generated at the same time, they appear later on the record as will be seen in Fig. 1586. Figure 159 (after Rankine) shows a gelatine shot artificial shock record. The new and only British seismograph instrument of the Cambridge Instrument Company is an advance upon Mintrop's original apparatus being more sensitive and dependable. It has been evolved as a result of the Iraq oil-field researches of Dr. A. 0. Rankine, Professor of Phys- ics, at the Imperial College of Science and Technology.^ Its advantages over other types lies in the linking device 1 We are indebted to Dr. Rankine for Fig. 160 and the details. Sympo- sium at the Institution of Mining and Metallurgy, Apr. 18, 1929; see also British Patent Specification No. 17402 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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