Taking Measure for the Bit^ etc. 



191 



tation at Vienna, invented a special instrument for as- 

 certaining all the necessary dimensions, and this should 

 be in the hands of all those who have any number of 

 horses to deal w^ith ; we have named it, for want of 

 some better word, the *' mouth-gauge " (fig. 15, A), 

 This instrument is usually made of steel, and consists 

 of a bar a b — about six inches long will suffice — fitted 

 on one side at right angles with a fixed cheekpiece c d^ 

 of the form shown by the figure, and having on the 



Fig. 15. 



other side a sliding cheekpiece e f of the same shape 

 and dimensions (six inches long), fitted with a screw 

 for fixing it where required. This bar ^ b is made oval 

 in the transverse section, wnth the greater axis about 

 one inch, in order to displace the lips nearly as the 

 mouthpiece does, and is usually graduated throughout, 

 but it will evidently suffice to do this with the fourth 

 and fifth inches. 



It is scarcely necessary to point out that if this gauge 



