CARE OF UTENSILS 



97 



for many years. Neglect and misuse are the 

 chief causes for dairy utensils getting out of 

 proper condition. 



EXERCISES 



1. Why should a dish rag not be tol- 

 erated in a dairy? 



2. How can you prove that sunlight 

 will prevent bacterial growth? 



3. Why not use wooden pails in pref- 

 erence to tin pails? 



4. Would you like to use the cream 

 from a separator washed only once a 

 day ? 



LABORATORY PROBLEMS 



XVI. To Determine the Pee Cent of Solids 



and Solids Not Fat in Milk by Means 



of a Qdevenne Lactometer 



when testing for 



__jj any lactometer 



determination, to nave the sample thor- 

 oughly mixed. The lactometer is stand- 

 ardized at a temperature of b'0° F., and 

 therefore the milk should be near that 

 temperature. The milk should be poured 

 into a tin cylinder, so that it will over- 

 flow when the lactometer is inserted. To 

 prevent waste, the cylinder can be placed 

 in a small dish before inserting the lac- 

 tometer. Allow the lactometer to be- 

 come stationary and read at once. 

 Observe the temperature and correct the 

 lactometer, reading by adding one-tenth 



Fig. 28. Que- 

 venne lactomet- 

 er. The "dairy 

 detective." I t 

 will show 

 whether milk 

 has been wat- 

 ered or skimmed, 

 if used in con- 

 nection with 

 the fat test. 



