THE DEPTH OF ROCK
> By the precise timing of sound waves transmitted through the earth, engineers of the Bureau of Public Roads in America have developed practical methods for determining the distance below the ground surface to solid rock. These engineers have perfected an instrument by which measurements can now be made on the surface with apparatus that will indicate within a few feet' how far below the surface rock-will be found. Engineers need such information in planning bridges and .buildings, estimating cost of grading for highways, and for other purposes. The measuring instrument is a sensitive seismograph, much the same as the instrument used for recording earthquakes. " The method saves the time and expense of drilling to find out [ how deep the rock lies.
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Bibliographic details
Evening Post, Issue 28, 1 August 1936, Page 13
Word Count
125THE DEPTH OF ROCK Evening Post, Issue 28, 1 August 1936, Page 13
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