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is 147 tons. But this is only one inftancc, 

 and out of th€ common courfe of bufinefs j 

 they commonly bring out a gang at a time, 

 which is four or fix, and as foon as they 

 are out of the tunnel, they are drawn by 

 mules to Manchejier, &c. 



The tunnel, where it palTes through 

 earth or coal, is furrounded with brick- 

 work, but through the rock it is only hewn 

 out. 



At the diftance of about a thoufahd 

 yards from the mouth, it divides into 

 two, which branch different ways, for 

 the convenience of loading coals in the 

 above compendious manner in every part 

 of the mine ; and more branches are in 

 contemplation : It has been afferted, that 

 thofe who go up both paffages travel there- 

 in three miles ; but this is an exaggeration. 



Every here and there along the tunnel 

 are wells, bricked from it to the top of the 

 hill, for the admiffion of air, the exhala- 

 tion of damps, and the letting down men 

 for reparations in cafe of accidents. 



I have read of tin tubes for the convey- 

 ance of air into this mine, but there is no 

 fuch thing ; the {hafts, pafTages, and tun- 

 nel fupply it fufficiently. 



As 



