Ria'i:i\ix(; and (,raijl\(j of milk axd crlam iio 



fat into the neck to about the 8 per cent mark, after which tlie 

 sample is given a hnal whirling of one minute. The sami)le is 

 then set in hot water at i3o°-i4o"' F. to bring it to the right tem- 

 perature for reading. A pair of dividers is general!}- u.-,ed for 

 measuring the fat column in taking the reading, \\lth milk, 

 the reading is taken from the highest to the lowest point, that is, 

 the meniscus of the fat column is included. 



Ik, 22 1 K. 2-, Fig. 24. Fig. 25 



Skim-milk Whole-milk Creamiest- y-gram cream 



test-bottle. test-bottle. bottle. test-bottle 



Babcock Test-bottles. 



In the Babcock test of cream either a g- or an iS-gram bottle 

 is used. The drift has been decidedl}- towards the use of the 

 bottle graduated to read per cent for 9 grams. A 9-gram sample 

 of cream is weighed into the bottle b}* means of a special cream 

 scale. To this are added about 9 c.c. of commercial sulphuric 

 acid, and the contents are mixed b}- giving the bottle a rotarA- 

 motion. When the action of the acid has proceeded far en(.)Ugh — 



