

II 



Another very common arnuigrnnent for locking A i. 



rjiart 



h IK turn.il rin-uUr. A ^t..\.- ' i* .1!-., tuin-l 

 this |>.'itt Tl.. nut tit* 



MM in mi.. ..f the part* connect* 



Thmugh this part paaaea a aet screw D, thepon hcan 



be made to prosa on the nut at the bottom of the groov. < 

 in turned back when the nut 11 U being moved, and when B 



crew ia acrewed up ao aa 

 'wi hard on the hot 



1 

 nut II is thua prev. 



acrew thread i nn :.. -1 <>tl 

 v at the } 



The use of the groove 



tin- JT 



set screw ia this : The 

 jH.int ..f the aet acrew in- 



ti th* nut and ruiaea a 

 l.ur win, h \\uiilil interfere 

 \\itli tlu free tuming of 

 tit*- nut in the reoeaa if 

 the bur waa not at 



in of a grom 

 ilitional security is 



tlmu.i;li tli.- jH.int of th.- I-., It. , u .,l 



Locking arrangeti rous, 



and many of th.-m UP da, l-ut want of apace i 



ta uadeiu-i-il.ii. ^' th.-m. We may point out, h..\\. 



.inly 



I.M-kinx' ! <it -i f rt-rtain JH mtaof a re\olutin, say at 

 30. It will U- noticed tl *o arnui^ 



have deacribed are not open to this ohjection. 





