. Deep borehole surveys and problems. Boring. GEOPHYSICAL METHODS OF INVESTIGATING 239 for obtaining greater magnification for smaller earth movements. It comprises a highly sensitive instrument Explosion of 1 Lb. Gelignite, Distance 1200 Yards Time Vio+ Fi I . I'. I . \'^^^\, Explosion of 11/2Lbs. Gelignite. Distance 1200 Ycirds Time Vioth. Second Fig. 159.—Seismographic records. for measuring vertical vibrations (the vibrometer) and, a camera for recording them. The vibrometer, shown in. Fig. 160.—^^Seismograph. Fig. 160 with the outer cover removed, consists of a heavy mass H fixed
. Deep borehole surveys and problems. Boring. GEOPHYSICAL METHODS OF INVESTIGATING 239 for obtaining greater magnification for smaller earth movements. It comprises a highly sensitive instrument Explosion of 1 Lb. Gelignite, Distance 1200 Yards Time Vio+ Fi I . I'. I . \'^^^\, Explosion of 11/2Lbs. Gelignite. Distance 1200 Ycirds Time Vioth. Second Fig. 159.—Seismographic records. for measuring vertical vibrations (the vibrometer) and, a camera for recording them. The vibrometer, shown in. Fig. 160.—^^Seismograph. Fig. 160 with the outer cover removed, consists of a heavy mass H fixed on a short lever carried on flexible steel hinges at /. This weight is balanced by springs Oi and 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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Keywords: ., bookcentury1900, bookcollectionb, bookpublishernewyorkmcgrawhill
