MACIIIM MUW1MG UfD DBBIOV 



ot tin- threads of tli.- l-.lt \\ith a ! iiial and 



W, as sho\\ liu f 1~. When in this condition the nut 



has no tendency to slack- tion due to 



the pressure mi tin- nut. Now suppose that tin- tendon W 

 on the l>o]i ,iy diminished, then tin- friction \\ h>h 



Opposes the tuniin.i: <f thr nut may }> MI inudi diminished 



may cause it to slat-ken Lark thnm^Ii I 



anu'h-. If this is repeated a great many times the nut may 

 slael ... ' i as to iM'o.m,- useless. 



A rcry -(.mni'>n arraiiLrm.-nt fir lui-kin.i: a nut i 



' i- an ordinary nut. and II one ha\ in- half tin- 

 tliiekir ( I .'^t screwed u}' ti^'ht so as to act on the 



Iwlt, as shown at (It), tij. 17. C is then sen urd <.n to] 



When ( is aln.' b1 M it -an he made, it i> held l,y one 



spanner, while B is turned hack through a small an.irh- \\ith 

 another. The action of the nuts upon the l.olt and upon one 

 now as shown at (fi), iiir. is. It will he seen that 

 the nuts are wedged tight on to the !>olt, and that this action 

 is independent of the tension W in the lolt. The nuts uill. 



in tiijht after th- t.-n-ion in the holt ! 

 It ise\ident that if the nuts are screwed up in th' in, 

 explained, tlie outer nut (' will .-anytli.- whole load on th- 

 l.olt : hence C should he the thicker of the two nut I 



be thin nut, culled the lork nut. 

 the outside, for the reason that ordinary sj> 

 thick to act on the thin nut when placed under th< otln i. 



