MlftCKLLASEOm QrEOTlONK 1 



kwtohun ehowing how you would flip MM! drive a 

 round inm bur fur thr parpoa* of turning it between toe 

 ee*m ota fete, 



u leqaMIQe fc>W toeaomandadjuat apieeeof 



A machi. ur- jawed dog^bnek to n .y nro 



a* truly M |***ible in a lathe. 



..re .ketchw* .bowing how the cutting Uihe or 



it ocurvd in place. 

 n II..M tin* dotting machine nun in fig. '> 



I l..wn when H" 



i the stroke altered, ami ht i tin- 

 |M%rt f the mm ? 



1 ' v mean* of ketchv *i i- i 



necurt* a wheel <>t j.ull,-\ ., the table of a dotting m . 

 for ' "ig key way, and how you would 



luljman.. mneceeuuy when the key way 



taper kr\ i.y aketchea th. 



f..nu ..f t ; 



the material -. >n t he omiatruetiun 



tlu- plunger of a water pin.. i 

 i a each cane give reaaoni for your = 

 , characieriatio properttea of the 



77 - -f aketohea deacrib. f--ur 



faateningB are uaed in connecting together parta 

 ..f uiiu -hini-H. .m.i quote one example for each fastening, in 

 u huh it IK preferable to uae that kind of fa*tening rather 

 than one of the othera, giving the reaaona : (1) a bolt and 

 nut : CJ) a rivet (:t) a cotter ; (4) a key. 



XXI. MAT! IN MA 



Ocui Iron. Tho easontial constitucnU of CMt iron are iron 



and carbon, the Utter forming from 2 to 5 per cent, of the 



total w< however, aaoally contains varying 



mall amounts of >ilu-on, sulphur, phosphorus, un. I manganeae. 



:u*t iron the carbon may exiat parti free atate 



irtly in chemical combination with the iron. 



