1.1 M viiiM PI; \\vi\i; \M> 



A Bide elevation, ui which tin- upper halt" is to show a 

 .km tlir.iii-h the axis of tin- cylinder, ami tin- 

 lower half an outside view of the ; ml 



An end elevation looking int<> UK ..p,-n -ml <>f the 

 piston. 



Notf. Dotted lines representing hidden parts .1 

 required to be drawn in either t xani] i hould 



the figured dimensions be inserted. 



Question*, only three to be anstcered. 

 The W 'fnatoer to these question* should be drav)< 



(a.) Select a special example of each of tin- foil,. wing two kinds 

 of fastenings. Sketrh the f..nns of the fastenings and 

 the forms of the nited. in the locality of the 



fastenings, and for each state the reasons \\hi.-h cause 

 that form of fastening to lie jirefeiTed to the other. 

 (1) a rivet ; (2) a bolt and nut. 



(/'.) Sketch in section a stuffing box and gland with holts or 

 studs, in tlie construction of which cast iron, wrought 

 iron or mild steel, and brass are all employed. Kxj.lain 

 why tin -. ials are used for the \ 



parts. 



(c.) With the aid of sketches, describe the construction of the 

 portion of the slide-rest of a lathe, l.y means of which 

 the tightness of fit of the sliding portion may be adjusted 

 after \N. 



(-/.I Make sketches showing the c< instruction of a scribing- 

 block, and describe one example of its use. 



(e.) State under what circumstances it would be appropriate to 

 use the pedestal bearing shown in figs. 149 and I."-", in 

 which only one brass step is provided. What are the uses of 

 the shell-cap ? Describe the means available for ad i 

 this bearing to the desired position of the shaft which it is 

 vequired to support. 



(/.) Describe how the piston rings shown in fi- 



made, and how they are placed in position. With tin- 

 aid of a sketch, describe how they are i 

 turning. M" 



