CHEMICAL TESTS AND ANALYSES 359 



above 60 add .0313 points to the observed reading'. For every 

 degree Fahrenheit below 60, deduct .0313 points from the ob- 

 served reading. 



The specific gravity is determined by the use of the following 

 formula : 



145.5 

 Specific gravity := ^ g _ R 



B - = Corrected Beaume reading. 



Example: Beaume reading at 80 degrees F. is 7.8. 



Corrected reading =7.8+ [(80 60) X -03131 =8.43. 



Specific gravity = ^g^g^ == 1-0615. 



Equally good results may be obtained by diluting the evap- 

 orated milk with an equal weight of water. Then take the Que- 

 venne lactometer reading at 60 degrees F. Multiply the reading 

 by 2, add 1000, and divide by 1000. 



Gravimetric Determination. 



Dilute the evaporated milk with four time? its weight of 

 water and proceed as directed under "Milk." 



Total Solids. 

 By Means of Specific Gravity and Babccck Formula. 



Determine the specific gravity as above directed. Multiply 

 by 1000 and substract 1000. Then use the following formula: 



-i+i.2xf. 



L The figure derived from the specific gravity by above 

 calculations. 



f - - per cent fat. 



Example: Evaporated milk tests 7.8 per cent fat and has a 

 specific gravity of 1.0615. 



L = (1.0615 X 1000) 1000 = 61.5. 



Total solids = ^-p -f 1.2 X 7.8 =r 24.74 per cent. 



For rapid determination of the total solids of evaporated 

 milk the factory operator is referred to the following tables from 

 which the per cent total solids may be read at a glance when the 

 B-eaume reading at 60 degrees F. and the per cent fat are known. 



