MILK-PLANT EQUIPMENT. 
31 
Table 0. — Temperatures observed in various tanks of automatic jet bottle 
washers. 
Plant No. 
Tank 1. 
Tank 2. 
Tank 3. 
Tank 4. 
1 
°F. 
90 
100 
110 
90 
120 
120 
150 
140 
°F. 
160 
140 
180 
180 
°F. 
200 
2. . 
170 
3 
4 
It is very important that the proper temperature be maintained in 
the various tanks. The temperature in the first tank must not be so 
high as to break the bottles, and it should be increased in each tank 
so that the final tank will be kept at a temperature near the boiling 
point. Care must also be taken to have the proper solutions in the 
various tanks. The first tank of large machines contains a strong 
alkali solution, the second a milder solution, and the remaining tanks 
rinsing water. 
CAN WASHERS. 
Can washers are of various types. Some of them are brush ma- 
chines while others operate on the same principle as the automatic 
bottle washers described, that is, by forcing solutions of washing 
powder, hot water, and steam into the cans. In order to facilitate 
drying, some of these machines also blow a blast of air into the can 
after steaming. 
Fig. 22. — Roller conveyers as labor-saving devices. 
