

TESTING DAIRY PRODUCTS BY THE BABCOCK TEST. JJ 



the left. Slide the counterpoise on the beam to the extreme 

 left and put the counterpoise weight, which is about equal to the 

 weight of the lightest bottle used, on the right hand pan and the 

 bottle to be weighed on the left. Unlock the pans by turning 

 up the lever on the left hand end at the bottom to a perpendicu- 

 lar position. Now slide the counterpoise on the beam slowly to 

 the right until the scale balances, as shown by the indicator 

 above vibrating equally each side of the middle division of the 

 lines to which it points. After the bottle is counterpoised, put 

 the 1 8 gram weight on the right pan, fill the pipette with the 

 cream to be tested a little above the 18 cubic centimeter mark, 

 and hold it so the nozzle just clears the neck of the bottle at the 

 opening, and allow the cream to run in. When the pipette is 

 nearly empty, the flow is checked by pressing the finger over the 

 opening at the top until the cream drops slowly. Now watch 

 the scale closely, and when the last drop makes the indicator 

 vibrate, or shows that the cream balances the weight, the pipette 

 is removed. If by accident too much is run in, a little can be 

 sucked up with the pipette or turned from the bottle, and then 

 enough dropped in to balance the weight. 



Another convenient method of putting in the cream is to 

 balance the bottle, then remove it from the scale pan and meas- 

 ure in 18 cubic centimeters of the cream, return the bottle to the 

 pan and add enough more cream, drop by drop, to balance the 

 1 8 gram weight. 



After a little practice one can do this very skillfully, and 

 nearly as rapidly as he can measure. When cream contains 

 more than 25 per cent of fat, use the 9 gram weight instead of 

 the 18, and multiply the result by 2. When 9 grams are taken, 

 9 cubic centimeters of water must be added and the usual 

 amount of acid. If, by chance, any cream is dropped on the 

 pan or outside of the bottle, it must be wiped off before the 

 weight is taken. No two bottles weigh the same and each must 

 be counterpoised before cream is put in it. 



