HI TRANSFORMATION OF ANY FIGURE, &C. 



A: : - xm fj?' y = 1 '^' Z=S *p ; 



If m If = z &. 



4 



-- 7 *=- 

 ~ r ~V"/? p* 



It appears from this that the only method of transforming a figure of three 

 dimensions, so that every angle in the system shall remain of the same mag- 

 nitude, is the method of inversion or of reciprocal radii vectores. 



[Reference may be made to "Me'thodes de Transformation en Gdomt-trie 

 et en Physique mathe'matique," par J. N. Haton de Goupilliere, especially \ii.: 

 Journal de FEcole Polytechnique, Tom. xxv., p. 188.] 



