[ 268 ] 

 would confumc the revenue of a whoI« 

 county J but fuch inventions as thefe eafe 

 the expence at leaft 5000/. per cent. 

 The following fketch, Plate VIII. Fig. i. 

 will give a clearer idea of thefe boat-wag- 

 gons. 



A. The boat that appears on a fide 

 view. 



B. The trough, fupported by the pieces 



V>j ^-^9 ^.^» 



D. The ends of the boats. 



E. That of the trough. 



I {hould tell you, that any part of this 

 aqueduct can be repaired without damag- 

 ing the reft of the canal, or lofing more 

 water than is contained within a fmall 

 ipace on each fide the part decayed ; for fe- 

 veral doors, of the fame nature as thofe 

 already defcribed, are fixed in the channel ; 

 and alfo trap-doors, or tubes, (if I may fb 

 call them,) at the bottom, &c. of the aque- 

 ducft, through which, by drawing a few 

 plugs, the water would prefently be dif- 

 charged into the Irwell, and the part to be 

 repaired, laid dry at once; a contrivance, 

 which is undoubtedly of vaft confequence. 



But 



