. Bulletin. ??lOCO /SCO 2000 3000 June Depths befow demck f/oorto strdt/g^raphic datc/m NSf =5S0NSa = 330 N° 3-130fi/04. ^100NSSIOO^N°6- ONS7- 50^N°820A/3/0/OO Ju/y A/?/ fi/?3 /voj f/^f Augu September SCAL £ O >000 iOOOft. ^yJS 2830 ^p,^g? ^^ 3070 2750 277S 0 500 lOCO r PROGRESS CHART OF WELLS DURING DRILLING. GRAPHIC PRESENTATION OF UNDERGROUND CONDITIONS. 55 is driven so that the top is a certain distance above the distance of the brad above the baseboard, which is the datumphme, is determined by the scaled distance of the top of the oil zoneabove datum. The tops of these br
. Bulletin. ??lOCO /SCO 2000 3000 June Depths befow demck f/oorto strdt/g^raphic datc/m NSf =5S0NSa = 330 N° 3-130fi/04. ^100NSSIOO^N°6- ONS7- 50^N°820A/3/0/OO Ju/y A/?/ fi/?3 /voj f/^f Augu September SCAL £ O >000 iOOOft. ^yJS 2830 ^p,^g? ^^ 3070 2750 277S 0 500 lOCO r PROGRESS CHART OF WELLS DURING DRILLING. GRAPHIC PRESENTATION OF UNDERGROUND CONDITIONS. 55 is driven so that the top is a certain distance above the distance of the brad above the baseboard, which is the datumphme, is determined by the scaled distance of the top of the oil zoneabove datum. The tops of these brads then represent the attitude ofthe oil-bearing bed. STEREOGRAMS. A stereogram is used to show the underground structure graphi-cally and to bring out a general broad relationship. In actual under-ground study to determine the proper casing depths, well depths, etc.,stereograms are of limited application, because they show threedimensions on a flat surface. Very little detail can be shown, as toomany flgures on a stereogram are confusing. The particular value of stereograms is to show general results tothe nontechnical man. Plate VI is a stereogram of the structureat La Salle, 111., and vicinity. This stereogram s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
