HAWS, 



Fig. 116 represents a mechanical saw-set by Blasberg of 

 Kemscheid, and Fig. 117 an American one by Morill ; in both 

 of them a is a bar which drives the teeth into position. 



Fig. 116. Blasberg' a Betting-iron. Fig. 117. Mm-ill's setting-iron. 



A wider set is usual with softwoods than with hardwoods, 

 and long saws also require a wider set than short ones. The 



Fig. lls. I'it-s;i\v. (After Feniande/.) 



set should never be more than double the width of the blade 

 at the base of the teeth. 



Kecently in America saws have been much used with per- 



Fig. 119. Frame-saw. (After Fernando/.) 



manently set teeth, their thickness being greater than the 

 blade of the saw. 



The action of sawing is furthermore affected by the resistance 

 of the different woods : this is greater in large pieces than in 



F.U. o 



