HAMMERS AND PERCUSSION. 



7 



sharpened edge of the adze, or the straight convex edge of the hatchet 

 and axe ; the panes make all angles with the plane in which the ham- 

 mer moves. 



Fig. 15. Cooper's Claw-Hammer. 



Figs. 13, 14. Boiler-Maker's Hammers. 



Fig. 16. Ship-Carpenter's Claw-Hammer. 



Fig. 16 is a ship-cai*penter's hammer-head with claw. It differs 

 from ordinary claw-hammers in that the handle is not strapped. In 

 some American claw-hammers the strapping is carried up the back and 



Fig. 17. Coach-Trimmer's Hammer-Head. 



front of the hammer. Why this change has been made is not very 

 apparent, for by it one strap that nearest the claw is in tension, 

 while the other is in compression. With the straps on the sides, as in 

 Figs. 18, 19, the tension is equal on both. Fig. 15 is a cooper's claw- 



J 



Fig. 18. Slater's Hammer. 



hammer, not strapped. In these cases, if much power is required 

 when the claw is used, it should be applied by pressure on the face- 

 end of the hammer as well as upon the handle. 



vol. ix. 2 



