(/V. B. It is much higher than the level of 

 the water, being fomewhat of a hill;) 

 upon which, and near the mouth of this 

 well, is erected a crane of a new construc- 

 tion, which turning upon a pivot, is brought 

 at pleafure over the well, and draws up 

 the coals. G. 



The boats are filled with fquare boxes, fit- 

 ted in exadly ; thefe are filled with coals, 

 (each contains eight hundred weight) at 

 the mine, for the convenience of being 

 eafily landed through this well ; they 

 therefore enter the fubterraneous canal, 

 and move on, until they come under the 

 well ; there they ftop, and the ropes, 

 which are fixed to the crane above, being 

 let down with hooks, at the end are 

 faftencd to the boxes, (which are ironed 

 for that purpofe) and then drawn up. 



The power of this crane is that of a water 

 wheel, contrived in a very fimple manner — ■ 

 the beft way of explaining it will be by a lit- 

 tle fketch, Plate IV. Fig. 3. But remark, 

 that I only draw this from idea, the cavern 

 in which the wheels work being under- 

 ground and below the furface of the fub- 

 terraneous canal; and all the light I had 

 was that of a farthing candle. I offer it 



only 



