PATTERN MAKING 



119 



These blocks are fastened by dowels, loosely, to the main part 

 of the core box, and after the core has been rammed up, the whole 

 box and core is turned over on its face and the main part of the 

 box is lifted off, after which the two loose blocks a and a can be 

 drawn away endwise and the block J can also be lifted out with 

 ease. 



GLOBE VALVE. 



The globe valve, shown in section in Fig. 218, is a good 

 illustration of a pattern in which, while the outside may be very 

 simple, the inside is intricate and requires considerable practice 



Fig. 218. 



and skill to so contract the core boxes that the core can be with- 

 drawn from them, and at the same time give uniform thickness and 

 strength to all parts of the shell and to the internal partitions. 



Fig. 219. 



In Fig. 219 is shown a sectional view of the body of the valve, 

 and in Fig. 220 an illustration of the completed pattern, from 

 which it will be seen that almost the entire work, with the exception 



