46 Testing Milk and Its Products. 



large enough to allow a quick emptying of the pipette 

 (fig. 17) and not so large that it is difficult to use it. 

 An opening of less than % in. diameter will be found 

 satisfactory. 



49. Fool pipettes. Soon after the Babcock test began to be 

 generally used at creameries as a basis of payment for the milk, 

 a creamery supply house put on the market a 20 cc. milk-meas- 

 uring pipette, which was claimed to show the exact butter value 

 of milk, instead of its content of butter fat, as is the case in 

 using the ordinary 17.6 cc. pipette. A 20 cc. pipette will de- 

 liver 2.4 ct. more milk than a 17.6 cc. pipette, (or 13.6 per cent, 

 more), and the results obtained by using these pipettes will, 

 therefore, be about 13.6 per cent, too high. In considering the 

 subject of Overrun (214) it is noted that the excess of butter 

 yield over the amount of fat contained in a certain quantity of 

 milk will range from about 10 to 16 per cent., or on the average, 

 about 12 per cent. 20 cc. pipettes may, therefore, give approxi- 

 mately the yield of butter obtained from a quantity of milk, 

 but as will be seen, this yield is variable, according to the skill 

 of the butter maker and according to conditions beyond his con- 

 trol; it cannot therefore be used as a standard in the same man- 

 ner as the fat content of the milk. Similar 22 cc. pipettes were 

 also sent out. These pipettes created a great deal of confusion 

 during the short time they were on the market, and were popu- 

 larly termed "fool" pipettes. It is not known that such pi- 

 pettes have been sold of late years. 



A recent Wisconsin law makes it a misdemeanor to use in 

 that state other than 17.6 cc. pipettes for measuring milk where 

 this is paid for by the Babcock test. 1 



50. Acid measures. A 17.5 cc. glass cylinder (fig. 9) 

 for measuring the acid is generally included in the out- 

 fit, when a Babcock tester is bought. This cylinder an- 

 swers every purpose if only occasional tests are made; 

 the acid is poured into the cylinder from the acid bottle 

 as needed, or a quantity of acid sufficient for the num- 

 ber of test bottles to be whirled at a time, is poured 



l Laws of 1903, chapter 48. 



