WHY CREAM TESTS VARY in 



lating screw is turned inwards, and if thinner, just 

 the reverse. The reason for this effect being pro- 

 duced is that, owing to the fact that thick or heavy- 

 bodied cream is lighter than thin cream, it conse- 

 quently remains nearest the centre of the bowl, and 

 also that less skim milk escapes with the cream 

 when the regulating screw is turned inwards, and in 

 the same way more skim milk escapes with the 

 cream, should the screw be turned the reverse way. 

 On the other hand, should it be observed that the 

 regulating screw is acting on the skim-milk outlet 

 in the bowl, which is the case with many machines, 

 then the operator must adjust the screw in exactly 

 the opposite direction to that required when the 

 screw is acting on the cream outlet. This may 

 appear to the uninitiated somewhat of an anomaly, 

 but it is nevertheless true, as when a regulating 

 screw which acts on the skim-milk outlet is turned 

 inwards, it produces a thinner cream owing to the 

 fact that by reason of turning the screw inwards it 

 reduces the size of the skim-milk outlet, thus forcing 

 more skim milk out with the cream and naturally 

 resulting in the production of a thinner cream. By 

 the same rule when the screw acting on the skim 

 milk is turned outwards, the reverse effect is pro- 

 duced. It should also be borne in mind that, 

 whether the regulating screw is acting either on 

 the cream or skim-milk outlets, half a turn of the 

 screw, one way or the other, makes a tremendous 



