490 Duke of BridgewaUr' s underground inclined Plant, 



hundred and Cxty tons. The weight of the carriage, fuppofe five tons, let down in the 



fame time, will be one hundred and fifty tons ; and the weight of the boat, fuppofe four 



tons, thirty times down, in eight hours, will be one hundred and twenty tons : — in all fix 



hundred and thirty tons down in eight hours. 



The weight of the carriage thirty times up, and thirty boats up, in eight hours, will be 



Carriage, at 5 tons, 30 times up = 150 tons 

 Boat, at 4 tons, 30 times up = 120 tons 



In all 270 tons 

 up in eight hours. 

 So that there will be 630 tons down 

 270 tons up 



In all 900 tons moved at the Inclined plane, in 8 hours, exclufive of an 

 indeterminate quantity of materials occafionally brought up for 

 the ufe of the higher level collieries. 



The various feeders which are loofened by opening the coals in the higher level collie- 

 ries, as well as three fufEcient refervoirs, which may occafionally be reforted to, and ufed 

 in a dry feafon, keep the higher level always to its height, and afford a conftant fupply of 

 water to fill the locks, for the purpofe of working the inclined plane. 



This inclined plane was begun in September, 1795; it was finifhed, and in ufe, in 

 October, 1797. 



Of this, as of moft of his other great works, the Duke of Bridgewater was himfelf the 

 planner and contriver : — to projeft greatly, and to execute completely, are the perfe£tion 

 of'genius. 



The fingularity of the place in which it is conflrufted ; the original boldnefs of the de- 

 Cgn; the ingenuity and mechanifm difplayed in planning and executing it; the difpatch 

 with which it has been finiflied ; the fimplicity, beauty, and harmony of its parts, tending 

 to one united whole ; and, above all, the perfeQion to which it is proved to have been 

 brought, now that it is practically in ufe ; render it equally aftonifliing with any other of 

 the ftupendous works which have been fo ably planned, and fo fuccefsfuUy executed, by 

 the firft projector and patriotic father of inland navigation. 



I have the honour to be, &c. 



Francis H, Egerton. 

 Bridgewater'Houfe, March 5, 1800. 



Reference 



