102 SWEETENED CONDENSED M1,.K—S?rRIKING 
Sampling of Batch.—The samples can be drawn from the 
pan by operating the two valves at the bottom explained under 
“Description of Vacuum Pan.” While the milk is condensing, 
the partial vacuum in the pan makes impossible the drawing off 
of the sample by simply opening the outlet. Instead of causing 
the milk to come out, air would rush in with violent force and 
would cause the milk in the pan to be thrown over into the con- 
Fig. 33. A con- 
venient device 
for sampling 
the condensed 
milk in the pan 
Courtesy of Fig. 34. A convenient device for sampling 
Arthur Harris condensed milk in the pan 
& Co. Courtesy of Arthur Harris & Co. 
denser, besides dangerously jolting the machinery. For this rea- 
son the outlet is equipped with two valves, both of which are 
closed during the condensing process. For taking samples, open 
the upper valve. ‘This allows the condensed milk to run into 
the nipple between the two valves. Now close the upper valve 
and open the lower one. ‘The milk will run out freely. The first 
sample should be rejected, as it may contain water caught in 
the nipple. 
For greater convenience and increased rapidity of sampling, 
especially constructed sample cups or striking cups, attached to 
the side of the body of the pan may be used. ‘These striking cups 
