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Published online by Cambridge University Press: 20 January 2009
Let a rigid body suffer a displacement to a new position, where it will be denoted by
Then any point A belonging to will take up a position A′ in . Let B be the point of F which coincides with A′. Then corresponding to B in there will be a point B′ in . Let this again coincide with C in , and so on. We have thus a sequence or chain of points whose relation may be thus indicated