Luke of BtidgewaUr' s undergroundinclined Plant. 49* 



Reference to Plate XXI. being a Plan and SeBion of his Grace theUvKZ OF Bridgewater's 

 Under-ground Inclined Plane, at Walkden-Moor Colliery, near Worjley, in Lancajhire. 



Figure 2. 



a to b. Dip of the metals and waggon-road on the under-ground inclined plane. From 

 h, on the lower level, to the mouth of the tunnel, is three miles. 



A, The eaft lock. 



By The weft lock. 



C, Reprefents a feftion of the lock ; the dotted line (hows the horizontal depth, and the 

 black line under it, the flope upon which the waggon-wheels run to receive the loaded 

 boat, or to bring the empty boat into the lock. 



d d. The main-fliaft, four feet eleven inches diameter, upon which the ropes work to 

 wind the boats up and down ; and here alfo the break-wheel is fattened on, together with 

 a fpur-wheel, and a nut-wheel. See Fig, 4. No. i. 



e, A paflage betwixt the higher level and the locks. 



//, A loaded boat going down, and an empty boat going up the unde-r-ground inclined 

 plane. 



G, A brick wall from the folc to the top of the inclined plane, In order to give addi- 

 tional fupport to the roof. 



h h h h, Openings through the brick wall G, into which a perfon may ftep out of the 

 way of the boats, at the time they are palling up and down. 



«', A bell, which is rung by the rope dotted to b, upon the lower level, at the bottom of 

 the under-ground inclined plane, to give notice when the empty boat is upon the waggon, 

 or cradle, and when the men below are re^dy, that the loaded boat may be let down by 

 the men above. 



k ky Holdfaft-ropes fattened to the main-ropes, and hooked on to a ring at the fouth 

 end of each boat, as it goes up or down, in order to ttay the boats upon the waggon or 

 cradle, that they may not fwag, or flip off. Thefe holdfaft-ropes are fpliced on to the end 

 of the main-ropes, and run above and between the two bridle-ropes when they are faftened 

 to the iron uprights, which are upon each fide of the waggons, or cradles : and they run 

 over the north end of the boat, to be hooked on to the fouth end. 



/ /, The bridle-ropes faftened to the main-ropes at 0, and fecured to two iron uprights 

 upon each fide of the waggon, or cradle. 



O 0, The places where the main-ropes, the bridle-ropes, and the holdfaft-ropes, are 

 faftened all together. 



No. I. An open fpace driven into the fide of the lock A, to which a pit is funk from 

 the higher level, in order to convey the water out of the locks down to the lower level, 

 and alfo to force a current of frefli air into the lower level collieries. 



3 R 2 Nc. 2, 



