The Rev. J. 11. Jellett on the Equilihrium and Motion of an Elastic Solid. 189 



in a body whose particles have been displaced from their original position of 

 free equilibrium. 



d'^_ d'^ . d^l d'^ 



, p d'n , p d'f, d-n 



+ 2 R fjL + 9/5 ^IL A.2B ^ 



+ ^^'^^' diidz + -^'- dxdz + ^^''^- dxdy 



+ 2C' .-^ + 2C ,^ + 2(7 ,— -^ 

 ^'■'' (/?/c^^ "''"' dxdz °^° rfA'tiy 



/ (^^„.,, rf^„^,. dA\ d^ 

 \ dx dy dz ) dx 



dx dy dz j dy 



^fdA^^d_A^^dA,,^\di (N) 



dx dy dz ■ j dz 



_^fdB^^dB^^dB^,J\dr, 



dx dy dz j dx 



^ fdB^,„ ^ dB,., ^ dB,\ dn 

 \ dx dy dz J dy 



_^(dB^^dB^^dB.,.^\dv 



dx dy dz J dz 



^(dC^^dC^^.^dC^d^ 

 \ dx dy dz j dx 



_^fdC^^dC,.^. , dC,.J\d^ 



dx dy dz j dy 



fdc^,^.^d_c^^da^dj 



dx dy dz ) dz' 



2 c2 



