Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 i8d R. W. CLARK AND HOLBROOK G. BOTSET quite well known. The authors acknowledge their indebtedness to A. E. Ruark, of the University of Pittsburgh, and Paul Weaver, Houston, Texas, for valuable suggestions in the conduct of this work. APPARATUS AND FIELD METHODS The measurements were made in soils which were developed over sedimentary formations consisting predominantly of sandy clays with Fig. i.—Diagrammatic section of radon measuring apparatus. some sli
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 i8d R. W. CLARK AND HOLBROOK G. BOTSET quite well known. The authors acknowledge their indebtedness to A. E. Ruark, of the University of Pittsburgh, and Paul Weaver, Houston, Texas, for valuable suggestions in the conduct of this work. APPARATUS AND FIELD METHODS The measurements were made in soils which were developed over sedimentary formations consisting predominantly of sandy clays with Fig. i.—Diagrammatic section of radon measuring apparatus. some slightly consolidated sands, all of Tertiary age. Most of the measurements were made in wooded areas, but some were in culti- vated fields, and some in natural prairies. The technique of making the measurements is a modification of the method developed by The equipment used is shown diagrammatically in Figure i. The hole into which the sampling tube is placed is made by first driving a steel rod into the ground about a foot and then continuing the hole with an earth auger. This is to 1 R Ambronn, Elements of Geophysics, English translation by Cobb (1928), p. 119. 510
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