308 MARKET DAIRYING 
labor and does very efficient work. The motive power 
may be either steam or water. 
Sterilizing. Vessels that have been washed in the man- 
ner described above may look perfectly clean, but may 
still be far from being free from bacteria. These can be 
destroyed only by exposing the vessels to the boiling 
temperature for some time. 
= = 
HOT WATER ance COLD WATER 
HoT WATER TANK | 
WAAAY 
MW. 
———— 
SS 
Fig. 59.—Cheap Arrangement for Securing Hot Water. 
NS 
SS. Kg. 
NS 
The simplest method of sterilizing is to place the vessels 
in boiling water for five minutes. This method com- 
mends itself especially to small dairymen who have no 
steam. 
Where no steam is available, the best means of pro- 
curing hot water is the apparatus shown in Fig. 59. 
The hot water tank is that commonly used in residences 
for heating water for the bath tub and can be obtained 
