DAIRYING. 43 



monly used for testing cows at the farm unless high pressure steam 

 is available, in which case a turbine tester may be used, or if elec- 

 tric current is handy the tester may be run by an electric motor. 

 All hand testers at the present time are made with cut gear instead 

 of belts or friction pulleys for transmitting the power of the crank 

 to the whirling bottle frame. Hand testers vary in size from tw^o to 

 twenty-four bottles. 



114. The two-bottle tester can be clamped to a table or bench. 

 They sell for $4.00. This price includes the necessary apparatus for 

 making tests complete. A four-bottle tester of this type sells for 

 $5.00. The bottles in these small testers, however, are enclosed in 

 separate pockets which whirl around in front of the person turning 

 the crank. 



115. Many users of testers prefer the slightly more expensive 

 machines in which the whirling bottles are enclosed in a cast iron 

 frame. These give the operator complete protection from broken 

 glass or spilled acid in case of an accident. 



116. The cast iron machines are made to test from 6 to 24 

 samples at one time. The prices of these testers with apparatus com- 

 plete for making tests are about : 



$ 8 for a 6-bottle tester. 



$ 9 for a 8-bottle tester. 



$10 for a 10-bottle tester. 



$12 for a 12-bottle tester. 



These testers weigh about 75 pounds and are substantially made. 



117. The acid used in making the tests may be bought by the 

 gallon in jugs at about 60 cents per gallon. These must be shipped 

 by freight. Larger quantities can be bought by the carboy at about 

 2 cents per pound. One pound of acid will make 14 tests. When 

 the glassware breaks, it can be replaced at approximately the follow- 

 ing prices: 



Per 

 Each. doz. 



Milk test bottles $ .15 $1.25 



Cream test bottles .20 1.50 



Skim milk test bottles 60 



Acid measures 15 



Milk pipettes .15 



