60 



Testing Milk and Its Products. 



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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 tester answers 

 every purpose. These may be had in 

 sizes from two to twelve bottles. In 

 selecting a particular make of tester 

 the dairyman has the choice of a large 



u'lu. 20. Type of ■' 



Babcock hand testers, 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, ^^'^- ^l- Type of Babcock hand testers. 



fully account for this condition of affairs. This ap- 

 plies especially to the early machines made with belts 

 or friction application of power. Hand testers made 

 with cog-geared wheels can be depended on to give the 

 necessary speed when run according to the manufactur- 

 ers' directions; the earlier machines of this kind were 

 very noisy, but at the present time the best machines 

 on the market are of this type. These are provided 

 with spiral cog-gearing and ball bearings, are strongly 

 made and will run smoothly and with little noise (figs 



