THE SYDNEY HARBOUR COLLIERY. 



147 



the miner shall be paid, and will then be tipped on a side tip- 

 pler similar to that of the Metropolitan colliery ; the coal will 

 slide over a stationary screen, the slack falling between the 

 bars into a billy-fair-play, while the round coal passes on to 

 a picking belt. The slack is taken by a scraper conveyor to 

 the boot of a bucket elevator, which raises it into a shoot. 

 From the shoot the slack can be diverted either to a tip or into 

 another scraper conveyor, which takes it to the boiler house. 

 The scraper conveyor, tippler, and screen were provided by 

 Messrs. Morison and Bearby, of Carrington, near Newcastle. 



The round coal drops on to a double-headed flight picking 

 belt, mounted on two strands of Jeffrey's malleable roller 

 chains. This belt is arranged at an angle of fifteen degrees; 

 is 120ft. from centre to centre, 4ft. wide, and is driven by a 



Fig. 82. Picking-Belt, Bin, and Loading Tower. 



12 h.p. motor, located near the head of the belt, at a rate of 

 60ft. per minute. Boys can stand 011 both sides of the belt to 

 pick out stone. The capacity of the picking belt is 250 tons 

 per hour, and it delivers into a 750 ton bin. (Fig. 82), which 

 has four valves beneath it. A portable 10- ton Pooley weigh- 

 ing machine, with a dial face, can be placed under two adjoin- 

 ing valves, from which it is desired to draw coal. This machine 



