. Deep borehole surveys and problems. Boring. iJL^ M fiS,. i 1 Fig. 4. Fig. 4a. Fig. 4.—Jahr's stratigraph—the recorder. Fig. 4a.—Showing relation of record to measures for estimating depth thickness of beds. and The chain is driven by belting r from the driving shaft of the engine *S. The recorder has several pens m^, m^, etc., spaced on the chain p at vertical distances equal to the depth of the record paper. Whenever a pen reaches the top edge of the paper it leaves it just as the next lower pen comes into action to continue the record, since their distances apart equal the depth of the gra
. Deep borehole surveys and problems. Boring. iJL^ M fiS,. i 1 Fig. 4. Fig. 4a. Fig. 4.—Jahr's stratigraph—the recorder. Fig. 4a.—Showing relation of record to measures for estimating depth thickness of beds. and The chain is driven by belting r from the driving shaft of the engine *S. The recorder has several pens m^, m^, etc., spaced on the chain p at vertical distances equal to the depth of the record paper. Whenever a pen reaches the top edge of the paper it leaves it just as the next lower pen comes into action to continue the record, since their distances apart equal the depth of the graph paper. Thus the record is got as a continuous series of broken lines which can be cut and arranged later if desired. It will be seen that the quicker the boring rods sink the more the curve will approach the abscissa direction and there will be a change in the curve for every different speed. 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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