60 



Testing Milk and Its Products. 



most of the machines placed on the market for this pur- 

 pose in the past have been so cheaply and poorly con- 

 structed as to prove 

 very unsatisfactory 

 after having been 

 in use for a time. 

 The sharp compe- 

 tition between man- 

 ufacturers of dairy 

 supplies and the 

 clamor of dairymen 

 for something 

 cheap, fully ac- 

 count for this con- 



FiG.21. "No-tin "test. dition o f a ff a i rs . 



This applies especially to the many machines made with 

 belts or friction application of power. The main objec- 

 tion to these ma- 

 chines is the un- 

 certainty of the 

 speed obtained, 

 when they have 

 been in use for 

 some time, and 

 the belt or fric- 

 tion appliance 

 begins to slip. 

 Hand testers 

 made with cog 

 gear wheels are 

 more to be de- 

 pended on for 



giving the nee- FIG. 22. Type of Babcock hand testers. 



essary speed than belt or friction machines ; the earlier 



