30 



CREAMERY BUTTER MAKING 



a reading, because of the expanded condition of the fat, 

 while too low a temperature gives an uncertain reading. 



141 



Fit.'. 12.— Milk bot- 

 Fig. II. — Waste acid jar. tie tester. 



Precautions in Making a Test. i. Be sure you have 

 a fair sample. 



2. The temperature of the milk should he about 6o 

 or yo degrees. 



3. Always mix twice after acid has been added. 



4. Be sure your tester runs at the right speed. 



