PKLAW MAIN" COLLIERY. 



3o3 



by scraper conveyors, and is then fed slowly into the fire-box 

 and pushed gradually forward by the movement of the fire- 

 bars, which have a backward and forward up and down motion. 

 A vertical spindle at the side of each boiler has a worm on 

 either end. This spindle is driven from a horizontal shafting, 

 on which are a fast and loose pulley, by means of a worm and 



Fij 



122. Automatic Stoker. 



worm wheels. The top part of the spindle actuates a shovel at 

 the bottom of the coal box, four cams pushing the shovel 

 backwards in turn, while a spring forces it forward again. The 

 lower part of the spindle imparts motion to the fire-bars. 



^s"eath Colliery. 



The Wickhani and Bullock Island Coal Company owns 

 this colliery., which is managed by Mr. Clein Jones. Here the 

 lower Greta seam is all in one. A bore struck coal on 3rd 

 October ^1905, at 286ft., where it was 26ft. thick Avithout the 

 bands, or 27ft. lOiii. including bands. Shafts were started the 

 first week in May, 1906, and the first train of coal was des- 

 patched to the Newcastle dyke on 26th February, 1907. This 

 is a shaft mine. The main shaft is 14ft. in diameter in the 

 clear, 299ft. deep to the roof of the seam, and it is lined 

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