ABEHMAIN COLLIERY. 



357 



in parallel. The voltage is 2-">0. These are driven by belts 

 from McEwan engines, which are 168 h.p. and 124 h.p. respec- 

 tively. These engines do excellent work, and require a mini- 

 mum of repairs. 



Hebbnrn Colliery. 



The township of Weston has grown up about this colliery, 

 which is one of those owned by the A. A. Company, whose 

 general manager, 'Mr. II. A. Harle, looks after it. The colliery 

 is only six years old. 



Fig. 224. Slack Box. 



Both the top and bottom split of the bottom seam are 

 worked. The top split is from 6ft. to 10ft. thick, while the 

 bottom split is 4ft. Gin. to 6ft. 6in. thick, and they are sepa- 

 rated by 20ft. to 50ft. of rock. Both splits are worked inde- 

 pendently, but are connected by stone drifts. The coal is ex- 

 tracted on the bord and pillar system, the pillars of both work- 

 ings being arranged one above the other. The mine is divided 

 into panels 20 chains square, with barrier pillars between, 1| 

 chains wide. The bords are 6 yards wide, and the pillars 16 

 yards. There are only working bords and cut-throughs at pre- 

 sent. They have not commenced drawing the pillars, but when 



