[ 22 7 J 



reeled through a tube to fill a box at a 

 time, at pleafure, which work is performed 

 almoft inftantaneouf.y, and the waggon fent 

 off again fcr a frefh cargo. 



But as the arches (reads) through the 

 mine in many places crofs each other, it 

 would there have been impracticable for a 

 man to puih fo great a weight around a 

 turning; to remove which objection, the 

 fquare 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 comes exactly on to the 

 fquare, and turning it till it faces the road 

 he is to go, he then piifhes 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 reft., in waggons to the 

 boats. 



When they are loaded they are linked 

 together in a g^ng; and for the conveni- 

 ence of drawing them out, there is a rail on 

 each fide the tunnel, for the perfon who 

 ftands in the firir. boat to hold with his hands 

 and draw himfelf along; which gives hint 

 fo great a power, that a boy of feventeen 

 has drawn out a gang : : twenty-one boats 

 loaded, which, at feven tons each, is an 

 hundred and forty- feven tons. But this is 

 only one inftance, and out cf the common 



Q^. 2 courie 



