CHEMICAI, TESTS AND ANALYSES 277 



60 add .0313 points to the observed reading. For every degree 

 Fahrenheit below 60, deduct .0313 points from the observed reading. 

 The specific gravity is determined by the use of the following 

 formula : 



145.5 

 Specific gravity : 145 5 _ R 



B = Corrected Beaume reading 

 Example : Beaume reading at 80 degrees F. is 7.8 



Corrected reading = 7-8 + [(80 60) X .0313] = 8.43 



145 5 

 Specific gravity = = 145-5 J a43 



Equally good results may be obtained by diluting the evaporated 

 milk with an equal weight of water. Then take the Quevenne lac- 

 tometer reading at 60 degrees F. Multiply the reading by 2, add 

 1000, and divide by 1000. 



GRAVIMETRIC DETERMINATION 



Dilute the evaporated milk with four times its weight of water 

 and proceed as directed under "Milk," page 262. 



TOTAL SOLIDS 



BY MEANS OF SPECIFIC GRAVITY AND BABCOCK FORMULA 

 Determine the specific gravity as above directed. Multiply by 

 1000 and subtract 1000. Then use the following formula: 



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 = -- + 1.2 X 7.8 = 24.74 per cent. 



