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 tester answers 

 every purpose. These may be had in 

 sizes from two to twelve bottles. In 

 selecting a particular make of tester 

 *iu -20 Type of the Dairyman nas the choice of a large 

 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, FlG - 21 - T ^ e 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 



