RiiRAL School Leaflet 



1233 



2. \VlR'n measuring a sample of milk with the pipette keep the index 

 fin^^er dry. 



3. When measurin*;; a sample of milk, keep the mark on the pipette 

 on a level with the eye. The same precaution should be observed when 

 readinjj; the percentage of fat after the test is completed. 



4. Do not tr}^ to measure a sample of milk by drawing the milk just 

 to the mark on the pipette. Draw the milk above the mark, as directed. 



5. When adding milk or acid to the test bottle, slant the bottle. The 

 liquid will then run down the lower inside of the neck of the bottle, and 

 will not be forced out by outcoming air. 



6. Do not hold the bottle so that its mouth points toward yourself 

 or any one else. The action of the acid on the milk produces great heat. 

 This heat often causes the contents of the bottle to spurt out violently. 



7. After adding the acid to the milk, shake the bottle thoroughly until 

 the contents become dark in color. 



8. After using the pipette wash it thorouglily, preferably in hot w^ater. 

 This will tend to prevent the transmission of disease germs from the 

 mouth of one person to another, should any such germs be present. 



9. The tester should Ijc firmly fastened to a solid bench or table. 



10. The person operating the machine should give his or her whole 

 attention to it, and not allow the fingers or the clothing to get in the 

 path of the bottle cups on an open machine. 



1 1 . Remove all objects from the vicinity of the tester. This will pre- 

 vent their being hit by the bottle cups when the machine is in motion. 



12. If acid is spilled use plenty of water, and then add an alkali, such 

 as lime or baking soda, in order to neutralize the acid. 



13. Do not leave the acid bottle uncorked. 



14. Keep all glassware perfectly clean. 



15. After wasliing the glassware, it is important to rinse it thoroughly 

 in clean w^ater so as to remove soap powder. 



78 



