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THREE elements are necessary to fix the position of a plane as I understand the word “position.” If “aspect” and “slope” be the names of two of these, the third will be the perpendicular upon the plane from some fixed point. It is because the term “position” implies the fixedness of this third element that it is inappropriate to express my friend Mr. Wilson's meaning.

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  1. THE CORRESPONDENT WHO SUGGESTED “SLOPE”

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    DOI

    https://doi.org/10.1038/005008a0

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