Elastic E>iuil)brium of Çeuii-lnfinite Solid. 



23 



/ 



Fig. 4. 



acting at the origin; and the maximum uf the difference between 

 the greatest and the least principal stress is 



D,no^= "-9" '^'^'' 



(55) 



acting at the point {r=0, ^=-|-) • The values of a/2 corresponding 

 to the curves are calculated in the last column of the above 

 table, and the positions of the critical points corresponding 



to them are shown also in the figure by the points F,, F2, 



It will be interesting to find the limiting height of mountains, 

 which stand on bases of several kinds of materials without crushing 

 the latter. In the foUowing table a few examples are given: the 

 third column contains the greatest heights of a mountain given by 



