16 Shrinkage, Swelling, Warping of Cross-grained Woods 



preceding phase. Through these three phases the board named yang 2 

 passed, but during the final stage of elongation there were fluctuations, 

 which possibly were due to the successive transverse belts or zones of 

 the board at different distances from the ends being at difierent phases, 

 and to irregularities in the rate of distribution of moisture in the board. 

 Dotted lines in Diagram 1 illustrate, on a very exaggerated scale, the 

 paths traversed by the points C and E during the absorption of water. 



Diagram 1 



When the board is drying and shrinking the reverse changes tend 

 to take place, as drying is most rapid at the ends and presumably so 

 along the lines of vessels. Yang 1 (tangential) went through such 

 changes completely, but yang 2 (tangential) and the radial board 

 showed merely the initial decrease and the succeeding increase in length ; 

 both associated with decrease in width. Dotted lines in Diagram 1 

 represent on a very exaggerated scale the paths of the points D and A 

 during drying. 



