"Tetrahedral co-ordinates" are a system of quadriplanar co-ordinates, the fundamental planes being the faces of a tetrahedron, and the co-ordinates the perpendicular distances of the point from the faces, a positive sign being given if the point be between the face and the opposite vertex, and a negative sign if not. [Please select]
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From each apex it is now necessary to draw straight lines to every other, each line representing one edge of the sixteen tetrahedral cells. [Please select]
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Their movements were helped by the fact that the tetrahedral form of the earth causes almost all the continents to be united by bridges of land. [Please select]
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Today, no less than in the past, the tetrahedral form of the earth and the relation of the tetrahedron to the poles and to the equator preserve the conditions that favor rapid evolution. [Please select]
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Even there, however, it is not wholly lost, for it revives in the cold, lofty continent of Antarctica, where it coalesces once more with the other great tetrahedral ridges of Africa and Australia. [Please select]
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Not only does each have the typical triangular form which would naturally arise from tetrahedral shrinking of the globe, but there are four other cardinal points of resemblance. [Please select]
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