.[ 274 ] 



About twelve years ago, thefe two engines being nearly worn 

 out, a new one was eredlcd at Saltom, capable of drawing more 

 water than the two old ones. It has two boilers, each fifteen 

 feet in diameter, a cylinder feventy inches in diameter, and a 

 working barrel eleven inches and a half. It can draw all the 

 water in eight hours which is produced in fummer in twenty- 

 four hours, but in winter it requires double that time as there 

 is double the quantity of water. This engine was repaired 

 about three years ago at a very great expenfe, with a new cy- 

 linder, new regulating beam, and new cylinder and fpring beams. 

 At this time it is admitted, by feveral profeflional men who have 

 examined it, to be the beft engine of the fize within the king- 

 dom. Its maximum in working is fifteen flrokes, "eacn fiv feet 

 and a half long in a minute ; each firoke draws twenty-feven 

 gallons of water, that is, four hundred and five gallons per mi- 

 nute, or nine thoufand two hundred and forty hogfheads every 

 hour. 



All the bands or feams of coal in this colliery dip or defcend 



nearly due weft, floping towards the horizon with a defcent of 



one yard in eight to one in twelve, and the feams arc always 



and invariably equally diflant from each other, whatever be the 



depth. However, though thefe feams of coal are thus always 



equally diflant from each other, yet they are not equally deep 



from the earth's furface. The feams, as before-mentioned, con- 



Itantly dip or defcend towards the weft, and rife towards the 



eafl, till at length they fhew themfelves in fome places on or 



near the earth's furface. 



Besides 



