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Published online by Cambridge University Press: 20 January 2009
The following is an elementary discussion of certain propositions in solid geometry which are commonly left to a later stage.
Let ABCD be a quadrilateral formed of rods freely jointed, let points E, F, G, H be taken on AB, BC, CD, DA respectively and let EG, FH be joined by rods freely jointed to the former. Let us investigate whether the resulting framework is rigid.