107 



3. TAPPING, TOOLS WITH A SQUARE OR STRAIGHT EDGE. 



Many of the knives already described also exist in a 

 somewhat different form with angular edges. Of the 

 marker there are types with square shaped cutting edges. 

 The tool most like the gouge is the Michie-Golledge 



FIGURE 38^. 

 Tapping Knives with square or straight cut. 



1. Michie-Golledge Tapping Tool. 



2. Miller's Tapping Knife. 



3. Sculfer's Tapping Knife. 



4. Bnrrydo Tapping Knife. 



tapping chisel. It will be seen on reference to the dia- 

 gram (fig. 38;: I) that the shape of the cutting edges 



permit the tool to be handled with great facility in 

 several directions. 



Various kinds of tapping knives with square cutting 



