192 CHAPTER XI 



But since ds sin « = d h 



ra rh 



i ds = \ n dl. 

 If V is the peripheral speed of the roller, the woik done in a unit of time 



IS w = V \ t ds = v\ n dl 



Kv 

 4 



{ir-a'-h^^) 



That is to sa}^ the work done in the compression of cane fibre is independ- 

 ent of such factors as the curvature of the rollers, the size of the miUs, etc. 



Fig. 8 1 



The power required, however, will vary with the skill of the designers and 

 of the operators. The work done in compressing bagasse is also independent 

 of the method used ; for example, direct pressure in a cylinder by means of 

 a plunger, or by means of rolling mills, as is the means adopted in practice 

 for the application of power. 



Relation between Fibre per cent, in Bagasse (Efficiency) and Tonnage 

 milled (Capacity and Power required).— In the immediately preceding section 

 on certain experimental observations, the power required to compress 

 100,000 lbs. of cane, with 12 per cent, fibre, in a 78-inch mill describing 

 23,400 sq. in. per minute to a layer 0-25 inch high was estimated at 35 H.P. 



To compress the same quantity to 0-20 inch will, under this general 



