neoufly, and the waggon fent off again for 

 a frelh cargo. 



But as the arches (roads) through the 

 mine in many places crofs each other, it 

 would there have been impraifticable for a 

 man to pufli fo great a weight around a 

 turning; to remove which objedion, the 

 fquiire of the floor in the crofs of the roads 

 is all of wood, and turns upon a central 

 pivot of iron, fo that the man flopping 

 when the waggon com.es exadlly on to the 

 fquare, and turning it till it faces the road 

 he is to go, he then pufhes on without the 

 leaft interruption. 



The coals that arife in the branches of 

 the mine below the tunnel are drawn up 

 through wells into thofe above it, and then 

 conveyed, like the reil, in waggons to the 

 boats. 



When they are loaded they arc linked 

 together in a gang; and for the conveni- 

 ence of drawing them out, there is a rail on 

 each fide the tunnel, for the perfon who 

 flands in the firfl boat to hold with his 

 hands and draw himfelf along ; which 

 gives him fo great a power, that a boy of 

 feventeen has drawn out a gang of twenty- 

 one boats loaded, which, at feventons each, 

 T 7. is 



