THE BULLI COLLIERY. 



is; 



first passed over an inclined shaking 1 screen made of punched 

 sheet iron, having a trough attached to it below to catch the 

 slack. The nuts are generally shipped, while the slack passes 

 through a Carr's disintegrator prior to being coked. The 

 slack makes better coke than the nuts, as the latter frequently 

 contains pieces of stone which add to the ash. The coal dust 

 is elevated by a bucket elevator, to a hopper, from which it 

 is fed into cannisters that run along the top of the ovens 

 into which it is charged. The coke is pushed put of the 

 ovens by means of a hydraulic ram. The water is supplied 

 to this rani through mains from a four-throw vertical plunger 

 pump. When the water is not required by the ram it passes 



Fig. 118. Hydraulic Earns. 



to an overhead tank. As the ram changes its position from 

 one oven to another, it is connected to another part of the 

 main water pipe by the hose. The ram is caused to travel 

 along its three rail track by an. endless rope (put in motion 

 by gearing from the pump) which circulates beneath it, and 

 to which it is attached by a clip when desired. The doors 

 of the ovens are raised by small vertical hydraulic rams (Fig. 

 118), suspended from an overhead rail, and when raised, the 

 doors are hung from their lugs by hooks. 



