THE BULLI COLLIERY. 



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across the turn off and parallel with the main line (Fig. 114). 

 Underground at Old Bulli the different districts are served by 

 the main and tail rope system of haulage. 



Railway trucks are tilled at the screens and drawn to and 

 from the brow of the self-acting incline by an endless rope, 

 to which they are attached by a small screw clip. One hopper 

 truck or two black trucks pass up and down the incline at a 

 time. The trucks are prevented from running down the in- 



11 V 



Fig. 114. Foot Point. 



-cline before the man in charge wishes, by means of block 

 stops, but there are no throw-off switches in case of accident. 

 The line consists of four rails for the top and middle sections, 

 and two rails for the lower section. The ropes are wound 

 round two drums mounted on one shaft; one rope goes over, 

 arid the other under. The brakesman controls the speed by 

 means of a lever. At the lower end, the line for the full truck 

 overlaps that of the empties on the flat, so when a full truck 

 starts from the top it first has the slack of the rope only to 

 iake up, and then to haul the empty a short distance on nearly 



Fig. 115. Sliding Weight. 



'horizontal ground before having to draw it up the incline. 

 The No. 3 tunnel is also served by a self-acting incline, but 

 this has three rails for the top portion, four rails in the middle 

 where the sets pass, and two rails at the bottom. Where the 

 four rails merge into two, an automatic point with a sliding 

 weight (Fig. 115) is used, while at the bottom, where the two 

 rails branch into four, for the full and empties, another auto- 

 matic point, with a fixed weight, is employed (Fig. 116). 

 At the bottom of the incline, the full skips run along an upper 



