Science: Sliding?

Are the North and South American continents rooted immovably into the curved crust of the earth, or are they slipping slowly away from Europe and toward Asia? Probably there is no slipping. The earth's crust is exceedingly solid, exceedingly strong.

Yet the sliding theory is not fantastic and merits testing. Last week, Major William Bowie, chief of the U. S. Geodetic Survey, indicated how the test could and probably would be made in 1926:

Radio stations, strung around the world so as to form a closed circuit of communication, would flash time signals to one...

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