问答题 翻译：Using this result fig. 1 is entered on the bottom line vertically to the intersection of the chart line and the conversion factors are read in the left hand column.

问答题 翻译：No attempt will be made to derive the formula or compare it with other flow formula, as so many excellent papers have been written on this subject.

问答题 翻译：This method is based on the difference in propagation velocity of artificially induced elastic waves through various subsurface strata.