FARM DAIRYING 



alarm. If it get on the hands or clothes, imme- 

 diately wash with water. Ammonia checks its 

 action on cloth or leather and restores the color. 

 The acid must be kept in glass or stone jars or 

 bottles, and always kept corked, as it weakens in 

 strength if exposed to the air. 



When each sample to be tested is taken as 

 described, put the bottles in the machine, placing 

 them so as to maintain the balance, and whirl for 

 four or five minutes. Stop the machine and add 

 sufficient hot water at a temperature of 140" to 

 float the fat into the marked scale space, on the 

 neck of the bottle. Rotate the machine again for 

 two minutes, then place the bottles in water at 

 about 140°, having the water reach as high as the 

 top of the fat in the neck, and read the fat column, 

 when at that temperature. 



It is well to use a pair of dividers or compasses 

 for measuring the fat. The points of the dividers 

 should be placed at the extreme upper and lower 

 limits of the fat column. Then carefully place the 

 one point of the dividers at the zero mark of the 

 scale ; the division at which the other point touches 

 will show the percentage of fat in the sample 

 tested. 



The small divisions of the scale read two-tenths 

 of one per cent, the large divisions equal one per 



[364] 



