. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 14 W. T. BORN AND J. E. OWEN lying in air at room temperature for several months. The observed natural frequency was 901 cycles per second and the weight 6,450 grams. The rod was then placed in an oven at 95 °C. for a period of 20 hours, and after it was allowed to cool to room temperature, the weight was found to be 6, grams and the natural frequency 931 cycles per second (Point 2). The weight Of the bar after this baking process was taken to be the "dry" weight, that is, the assumpt
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 14 W. T. BORN AND J. E. OWEN lying in air at room temperature for several months. The observed natural frequency was 901 cycles per second and the weight 6,450 grams. The rod was then placed in an oven at 95 °C. for a period of 20 hours, and after it was allowed to cool to room temperature, the weight was found to be 6, grams and the natural frequency 931 cycles per second (Point 2). The weight Of the bar after this baking process was taken to be the "dry" weight, that is, the assumption was made that only a negligible amount of water remained after this baking period. The rod was then moistened and placed in a closed tube at room temperature for a period of 36 hours in order to allow the moisture to distribute itself throughout the bar. The weight and natural 800- FREQUENCY "VSEC. 6600 6700 WEIGHT IN GMS. 6600 Fig. 4. -Variation in natural frequency of Amherst sandstone bar with weight as water content is changed. frequency were then determined again, the former being 6, grams and the latter 538 cycles per second. These values are those corresponding with Point 3 on the curve. The rod was next allowed to dry in air for several hours and then placed in a closed tube for a day to reestablish moisture equilibrium. Point 4 indicates the weight and natural frequency after this procedure. Subsequent determina- tions, corresponding to points 5, 6, 7 and 8, were made in similar fashion. To obtain Point 9, the rod was again baked for about 5 hours and the weight and natural frequency determined. Several features of this curve are of interest. Perhaps the most striking is the extremely rapid reduction of velocity which accom- panies the addition of the first increments of moisture and the slower reduction as a greater amount of water is added. A second interesting point is the fact that the curve indicates that the addition and re- moval of the water caus
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Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting
