B6 



M\<iu\i: 





the valve is open ; C is a portion of the lever, to the on fri- 

 end of which the ball is attached. The valve-spindle is 

 usually horizontal. 



<dtr- 



/,'"// 

 .Draw, full 



tllf VU-WH of this V.'.hf 



shown in tig. 71. 



All thr . '.sare 



>f brass. 



