CANE SUGAR. 



Pressure Regulators. Mills of the pattern exemplified in Fig* 

 101 may be referred to as rigid mills, that is to say, the distance the rollers 

 can be separated is limited by the setting and depends on the elasticity or 

 ' give ' of the mill ; with such a pattern the pressure exerted on the layer of 

 megass is dependent on the quantity passing and any sudden strain, due either 



to malice or accident, may result in the fracture of the mill. To overcome 

 this trouble all recent mills are provided with pressure regulating devices 

 which both maintain a constant pressure down to a certain minimum thinness 

 of feed and also allow a roller to lift in the case of the passage of any in- 

 compressible material such as of a piece of iron. 



194 



