148 EvaroratED Mi,.K—MojJoNNiiéR CONTROLLER 
dispensing burette. This is the amount contained between the 
upper two graduations on the burette. To cup marked No. 2 
add two charges, to cup No. 3 add three charges, to cup No. 4 
add four charges. Dispensing burette furnished with the con- 
troller indicates how the above quantities are to be added; the 
burette is graduated into four separate charges. The unit with 
one single charge contains the equivalent of one ounce of sodium 
bicarbonate, to one thousand pounds of evaporated milk. Each 
successive charge is a multiple of this unit. In dispensing the 
bicarbonate solution, it is best not to fill the bottle more than 
half full. When filling the burette, the solution should be 
allowed to flaw into it slowly in order not to trap in the air. If 
air is trapped into the burette. it is difficult to remove it, and 
in such a case it is best to run out whatever solution may be in 
the burette and to put in a new supply. 
Whenever the quality of the milk is very abnormal, it may 
be necessary to add more than above indicated number of 
charges of bicarbonate solution to the sample cans. In such 
cases any multiples of the above number of charges may be 
added. The ratio of ounces of bicarbonate to one thousand 
pounds of milk will remain the same, being increased simply by 
the number of charges added to each sample can. 
Preparation of the Five Sample Cans for the Sterilizer— 
After the five open-top cups have been treated with bicarbonate 
as indicated in the preceding section, they are transferred to the 
Torsion Balance and exactly six ounces of milk is weighed into 
each cup. This can be done by taring the entire set of empty 
cups, and then weighing six ounces of evaporated milk into each 
separate cup. 
One set of five empty cans is now marked in the same man- 
ner as the cups to which the bicarbonate solution was added, 
namely as follows: X = can containing no bicarbonate; 1 = can 
containing equivalent of one ounce bicarbonate per thousand 
pounds of evaporated milk; 2 = can containing equivalent of 
two ounces per one thousand pounds of evaporated milk; 3 = 
gan containing equivalent of three ounces per one thousand 
pounds of evaporated milk, and 4+ = can containing equivalent of 
four ounces per one thousand pounds of evaporated milk. 
Next the contents of the five open-top cups are transferred 
