76 MANUAL FOR SUGAR GROWERS. 



cnisliing as possible, and yet not endanger the safety 

 of the mill by straining or breaking it from over- 

 pressure. In the space between the rollers A and 

 C is fixed a bar or plate — the trash-tnrner, or 

 dumb returner, which serves to direct the crushed 

 cane between the rollers B and C. The mass of 

 crushed canes sometimes becomes jammed between 

 the dumb returner and the rollers, leading to stop- 

 page, and sometimes even to breakage, of the mill. 

 Hence efforts are being made to construct mills in 

 which the use of a dumb returner is dispensed with. 

 Other mills are constructed with four or more rollers. 

 Many kinds of mill have been designed, for each of 

 which some sj^ecial advantage has been claimed. 

 Many of these are simply of the ordinary three- 

 roller type, with various modifications in their con- 

 struction to afford greater strength or security. 



Fig. 9.— Diagram of Fletcher-Le Blanc four-roller mill. 



Among those calling for special comment may be 

 mentioned Fletcher k Le Blanc's four-roller mill, 

 in which the cane is submitted to three crush- 

 ings, as will be seen from the diagi'am. Fig. 9. 



