60 



Testing Milk and Its Products. 



69. Hand testers. When only a few tests are made 

 at a time, and at irregular intervals, as in case of dairy- 

 men who test 

 single cows in 

 their herds, a 

 small hand test- 

 er answers every 



may be had in 

 sizes from two 

 to twelve bot- 

 'tles. In select- 

 ing a particular 

 make of tester 

 the dairyman 



FIG. 20. Type of Babcock hand testers. has the choice 



of a large number of different machines. Most of the 

 first machines placed on the market for this purpose 

 were so cheaply and 

 poorly constructed as 

 to prove very unsat- 

 isfactory after hav- 

 ing been in use for a 

 time. The competi- 

 tion between manu- 

 facturers of dairy 

 supplies and the 

 clamor of dairymen 



for Something cheap, FIG. 21. Type of Babcock hand tester-. 



fully accounted for this condition of affairs. This ap- 

 plies especially to the early machines made with belts 



