NEATH COLLIERY. 



355 



-through spur gearing to a 5 h.p. motor. A three skip tip- 

 pler, lift. Gin. diameter, delivers the coal on to the conveyor 

 through a shoot. 



Abermain Colliery. 



This colliery, formerly known as the Silkstone Coal Mine, 

 is nine years old, and belongs to the Abermain Colliery Com- 

 pany Ltd. The manager is Mr. J. Jeffries. 



The seam dips one in eighteen, and is worked from tun- 

 nels. (Fig. 223.) All the top seam is worked. 



Fig. 223. Entrance to Main Tunnel. 



The more recent workings are laid out in panels of 200 

 yards. Originally all bords were taken out on a level course, 

 but now levels are driven off the main places, and bords turned 

 off from them to the rise. The bords are 8 yards wide, and the 

 pillars 9 yards. Xo pillars have been worked as yet. Cut- 

 throughs are made every 44 yards. The pillar between a pair 

 of levels is one chain wide ; the barrier pillar at the end of the 

 bord, which is not broken through, is 11 yards wide. 



The coal is undercut by 15 Jeffrey electric chain breast 

 machines. 





