I2O Book of Engineering 



Frost will, in one night, undo the work 

 of weeks, and often the workman must stay 

 up all night to watch his charge, just as 

 the shepherd on the adjacent hills is keeping 

 his vigil too. The pot is built up in layers 

 of about four inches high, and as each 

 layer is added the pot must be left for 

 several days to dry. When it is finished it 

 is grey in colour and resembles something 

 like a small hippopotamus, but without legs. 

 Ten months are required for the pot to dry 

 out, and during this period it needs constant 

 scrutiny to determine whether all is well, 

 whether the drying needs acceleration or 

 retarding, and whether the tiniest crack is 

 visible. 



The day comes for its despatch to the 

 glass works, and the greatest care is neces- 

 sary in handling it. When it arrives at the 

 works it goes into store, there to await the 

 cracking of a pot already in use, though 

 some are so good that they actually wear 

 out without a crack appearing. 



The new pot does not pass straight to 

 normal duties ; if it did it would most likely 



