PREVENTION AND REPAIR OF MECHANICAL INJURIES 153 



A modification of the butcher's saw, with swivels that 

 permit the very thin, narrow, fine-toothed blade being 

 set on the bias, is particularly good for small branches 

 and twigs, because the heavy bow gives weight to the 

 light blade, which makes clean cuts at any angle desired. 

 This is the type of saw the author specially likes for the 

 work it is capable of doing. 



FIG. 112 PRUNING KNIVES OF VARIOUS STYLES 



The three upper ones differ little except in the shape of the handle. The bot- 

 tom one is a Nagle Re-blade knife in which the blades are replaceable. This is a 

 convenient style because an assortment of blades may be kept for changing from 

 dull to sharp ones, or to different forms. The blades readily slip into the handle 

 when in the nearly closed position. 



In Fig. 117 is shown a set of saws designed for student 

 use. The interchangeable blades permit a variety of 

 demonstration work. In practice, however, the author 

 and his experienced students did not like this particular 

 design. The blades are too light, and the grip part of the 

 handle too small for any but small-sized hands. 



