426 THE YOUNG FAEMER's MANUAL. 



lar backs between A and B. Those teeth between A and B are 

 the strongest, and if the spaces- at the roots of them be filed with 

 a half-round file, the teeth will be still stronger. The lacks of 

 the teeth for one-fourth or half an inch back from the points, 

 according to the size of the teeth, should be on a line drawn from 

 the point of one tooth to a point as much below the point of the 

 tooth behind it, as each tooth is required to cut in depth, as at c c. 

 If, for example, a saw cuts one inch in one revolution, and has 

 forty teeth, the teeth back of the points must be filed below the 

 points, so as to be on a line drawn from one-fortieth of an inch 

 below one point, c c, to the point of the tooth forward of it. 

 Such a shape will allow the teeth to cut just as easily as if the 

 backs of them were like those between and D. The filer 

 should be very careful to have the points of the teeth more 

 prominent than they are just back of the cutting points. These 

 teeth, that are formed like those between A and J9, will cut 

 very much faster, and with less power than either of the other 

 kinds. They seem to cut a kerf through a stick, while teeth 

 with less hook scrape or file out the kerf. But teeth of such 

 a shape must be made only in a saw of the very best materials, 

 and for sawing hard and knotty wood there is great danger of 

 breaking them, For all soft wood such teeth work most admi 

 rably. Such teeth must never be bent in setting, but swedged 

 with the swedging set, Fig. 180. The teeth between C and D 

 are for cutting across the grain. The correct hook is found by 

 drawing a line from the points of the teeth to the centre of the 

 saw ; or, at a right angle to the cutting edge of the saw. This is 

 allowed to be the best angle for the face of all crosscutting saws, 

 except such as have no hook tp the teeth, like Fig. 181. It is 

 of very little consequence so far as cutting is concerned, what 

 the shape of the back of a tooth is, if the part lack of the point 

 is far enough back of, or below the line of motion, in which the 

 points move, for all the teeth to enter the wood freely. If the 

 lack of a tooth be higher than the point, a tooth must wear its 

 way through a stick instead of cutting through. 



