. Deep borehole surveys and problems. Boring. AUXILIARY REGISTRATIONS IN BOREHOLE SURVEYS 23 faster the boring progresses and the flatter the slower the crown penetrates the measures; therefore a horizontal portion of the line shows that the tool is not piercing the rocks even though the rods are rotating; that is to say, that the rod feed is not paying out. When the plant is S^^m%^ Y/////?///^/y//////i^/^^///'//^,. Fig. 3.—Jahr's stratigraph—the derrick drive. idle, and therefore the driving shaft of the recorder, the registration ceases. The most important inferences from the record are prov
. Deep borehole surveys and problems. Boring. AUXILIARY REGISTRATIONS IN BOREHOLE SURVEYS 23 faster the boring progresses and the flatter the slower the crown penetrates the measures; therefore a horizontal portion of the line shows that the tool is not piercing the rocks even though the rods are rotating; that is to say, that the rod feed is not paying out. When the plant is S^^m%^ Y/////?///^/y//////i^/^^///'//^,. Fig. 3.—Jahr's stratigraph—the derrick drive. idle, and therefore the driving shaft of the recorder, the registration ceases. The most important inferences from the record are provided by changes of direction in the pen line because they show that different strata have been struck and thus provide valuable clues as to the conditions arising in this new ground. Such a change in the line only occurs in the flatter measures; in inchned deposits the change is more gradual because the crown only then penetrates the new stratum gradually. In Fig. 3 note that the motion. 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
Size: 1499px × 1666px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionb, bookpublishernewyorkmcgrawhill
