272 



The Farmstead 



should chance to pull endwise a crack would 

 appear to the right of the dotted line, since in 

 the seven layers shown there is but one stone, 



A, that has suffi- 

 l cient contact to 

 bond the two 

 I stones upon which 

 it rests. The wall 

 should also have 

 its face and back 

 side tied together 

 or bonded, or it 

 may split apart 

 near the middle. 

 ^^^^?V/i'^€r: Two walls, one of 

 i^psi^^^'^^^'^t^-^^i-'^f^ which is properly 



I ^ 



Fig. 102. 

 Good and faulty construction in a wall. 



i bonded, the other 

 ^^ is not, are shown 

 in Fig. 103. One 

 layer only of stone 

 can be shown in the diagram, but it will readily 

 be seen that if the course which is placed on the 

 one shown is laid like it, — that is, if the faulty 

 bonding near the back side be continued for 

 several courses — the wall will pull apart. The 

 small, narrow stones have been placed at the 

 back side of the wall, and the good stones in 

 the front of the wall; this is all very well, 

 but some long stones should reach from the 



