414 



to be sawed is all soft wood, a saw will cut the fastest if -four 

 teeth two on each side are filed quite fleaming on the /ace, 

 and every fifth tooth filed square across it on the face and back, 

 without setting them. When teeth are all filed very fleaming, 

 and none filed square to clean out the chip or core, it will be 

 necessary to bear on in sawing. 



619. Slitting-saws are always filed square across on the face of 

 the teeth, and usually square 'on the back of them ; although 

 some filers contend that it is better to file a little fleaming on the 

 backs at the points. As it is very difficult for beginners to retain 

 the proper angle in- all the teeth, and to file every tooth of exactly 

 such a size and form, with nothing but the eye for a guide, 



A SAW-FILER, 



620. A perspective view of which is shown at Fig. 171, is 

 found to be a very useful implement. With such a filer, any 



FIG. 171. 



1GUSON. ALB 



farmer can file his saws in a most complete manner, giving every 

 tooth exactly a certain angle, both on the face and back, and of a 

 given hook, and just so long and no longer, nor shorter ; and 

 besides, if every tooth is filed to a point, the saw will be neatly 

 jointed. It consists of a clamp like Fig. 169, with an iron plate, 

 a, screwed firmly to the jaw of the clamp. ~b is an iron slide, which 

 is neatly fitted by notches or gains to the true edges of a, which 

 is slid along the jaw, back and forth, from end to end, by the 

 endless set-screw and wheel c, fastened in front of the iron plate 

 a. d is the handle of the iron plate which holds the file which 

 plays back and forth in the iron post E, which is fastened to an 



