THE TIMBERS OF NEW SOUTH WALES. 



193 



Two pieces of timber unseasoned, planed 

 and worked square, also bolted together, 

 heart side to heart side. 



Effect of drying or seasoning on these 

 pieces ; " open at the heart \ inch." 



Effect of drying or seasoning on these 

 pieces if heart side is reversed thus ; 

 "open top and bottom \ inch." 



OJ 



Piece of^timber 

 cut on the 2 



quarter. 



Will always 

 shrink when 



drying in 

 this manner. 



6" 



5W 



These dimensions apply to ironbark ; other hardwoods shrink 

 in a similar manner, but to a greater extent. 



These sketches point conclusively to the fact that no matter 

 how accurate the fit in the first instance may be, or how strongly 

 the timber may be bolted together, no unseasoned two or more 

 pieces will maintain a perfectly close joint. 



In using hardwoods, the heart side of each piece should always 

 be turned down or inside, as the case may be, because as I have 



K— Anau t 1, 1804. 



