EXAMPLES OF FISSURING. 



03 



It is apparent from the formulas that e and b fully determine w, v and 

 w. It is also true that if the two values of w and the angles between the 



Figure 10. — Results of Rupture by Pressure at 30° to fixed Plane. 



It is assumed that/= — 4e and that 6= — 1. Thus c = 0.0577 =g and/ = — 0.2309 ; to = 31° 20' ; 

 (o = 28° 42'; v = — 22° 37'; /«. = — 51° 19'; ft = 0.951; .4 = 1.562; £ = 0.521; C=1058: D — 0.92G; 

 w = 7U5 or 0.481. The range for one set of planes of maximum tangential strain is o° 41' and for 

 the other 28°. 



cracks (or 2 w) were known by observation, the displacements and the 

 value of <p could be deduced. The two values of w would in such a case 

 enable one to find v and e, while when these quantities are ascertained, 



Figure 11.— Results of Rupture by Pressure at 00° to fixed Plane. 



the formula for tan 2 * will give b. Finally tan <p = 6/10 e. But to de- 

 termine the direction of the force in this manner it must be shown that 



X— Buix. Geol. Soc. Am., Vol. 4, 1892. 



