354 CHEMICAL TESTS AND ANALYSES 



one-quarter inches ; width of empty bulb, thirteen-sixteenths of 

 one inch. 



Hydrometer Jar. Use a glass or tin cylinder with substantial 

 base, minium length twelve inches, minimum width one and a 

 half inches. 



Determination. 



Use the original undiluted condensed milk. The Beaume hy- 

 drometer is graduated to read correctly at 60 degrees F. (15.5 de- 

 grees C.). At this temperature the sweetened condensed milk is 

 too viscous for rapid and accurate work. Warm the condensed 

 milk to 100 degrees F. or above and correct the Beaume reading 

 by adding to the observed reading .025 points for every degree 

 Fahrenheit above 60. At a temperature of 100 degrees F. or above, 

 the reading can be made in fifteen minutes or less, after the hydro- 

 meter is inserted in the milk. 



The specific gravity is determined by the use of the following 

 formula : 



c <: <* 144 - 3 

 Specific gravity =: 



144.3 _ B 



B = Beaume reading at 60 degrees F. 

 Example: Observed Beaume reading at 120 is 31.6. 

 Corrected reading =31.6+ [(120 60) X -025] =33.1. 



144 3 



Specific gravity = = 1.2977. 



144.3 _ 33.1 



The following table shows the specific gravity of sweetened 

 condensed milk when the Beaume reading is known. 



