40 BITS AND BRIDLE GEAR. 



chain passing round the lower jaw of the horse. To express 

 the matter scientifically, the curb is a lever of the second 

 order, in which the power is the pull of the reins (4, Fig. 91) ; 

 the weight, the bars of the mouth, against which the mouth- 

 piece presses (i, Fig. 91) ; and the fulcrum the chin-groove 

 (2, Fig. 91), which is the depression at the back of the lower 

 jaw and immediately above the chin, in which the curb-chain 

 should rest. 



Fig. 46. Ordinary Curb Side View. 



The names of the different parts of a curb (Fig. 46) are 

 as follows : 



ad and hi Cheek. 



ab and hi Upper end of cheek. 



bd and il Lower end of cheek. 



bi ...... Mouth-piece. 



efg Port. 



be and gi Keel or cannon. 



c and k Chin-strap rings. 



a and h Top eyes. 



d and 1 Loose rings. 



b and i Butts. 



m, m Curb-chain hooks. 



The curb-chain is attached to the top eyes by means of the 

 curb-chain hooks. 



The chin-strap or lip-strap (Figs. 47 and 48) passes through 



