APPLICATION OF REFKIGERATION TO HANDLING OF MILK. 
35 
scale. In double-pipe condensers and coolers it is not such an easy- 
matter to clean them as 
it is necessary to take 
off a return bend from 
the end of the condenser 
or cooler in order to ex- 
amine or clean them. 
This should be done 
frequently, and if the 
inner pipe is found to 
be coated with a soft 
substance it can be re- 
moved by the aid of an 
ordinary flue brush. If, 
however, the coating is 
in the form of scale, it 
will be necessary to' bore 
it out on a lathe or tube- 
boring machine. 
The life and satisfac- 
tory operation of all me- 
chanical apparatus are 
dependent on proper 
care as well as on the 
original design. It is 
therefore necessary that 
such apparatus should 
receive frequent and 
careful inspection and 
prompt correction of all 
defects found. As clean- 
liness is essential for the 
satisfactory operation of 
machinery of all kinds, 
the wearing parts of the 
machine should be kept 
free from dirt and grit 
and the oilways open, 
well lubricated, and ad- 
justed. The clearance 
of the pistons should be 
adjusted to a minimum, 
both in the steam and 
avnsmav* mg/m 
compressor cylinders. 
In operating an ammonia plant the gages should be carefully 
watched, as they are the indicators of the work being done. The 
