executed at Walkden-Moor . 35 



cafl-lron roller of eight inches and a half diameter is fixed 

 acrofs the weft lock, parallel to the upper weft lock-gate, 

 and near the north end of the lock, bat half a yard higher 

 than the gate, in order to hear up the rope, and to prevent 

 it from fwagging. 



A hold-faft rope is faftened to the main-rope, to ftay each 

 boat upon its waggon, as they go up or down. It is marked 

 lik, in fig. 4, Plate I. and its ufes are more particularly de- 

 tailed in the table of reference, at k k, to that plate. 



Upon this horizontal main-fliaft is a break-wheel above 

 mentioned, which regulates the motion of the loaded boat 

 going down the inclined plane. 



The number of iron teeth, or cogs, in the fpur-wheel, 

 which is faftened to the fide of the break-wheel, is three 

 hundred and feventy-two; and the little nut- wheel. No. 3, 

 iig. 5. which fets it in motion, contains eleven teeth, or cogs. 

 The nut-wheel is fupportcd by two uprights from the pillar 

 to the roof, and works between' them. Two winches or 

 handles. No. 44, %. 5, on its axis, put the main-ftiaft, dd, 

 fig.* 4. or No. I, fig. 4. in motion. The power of both 

 lanited enables a man, who ufes a force equal to forty pounds 

 weight, to fet forward two tons upon the waggon-road : and 

 this force, multiplied at the winches or handles, may be 

 vifed to fet forward th^ loaded boat out of one lock, and to 

 bring the empty boat into the other. The boats being thus 

 put in motion, the little nut-wheel is difengaged from the 

 main-fliaft, by a flide drawing the little nut fideways, fo as 

 to difengage the teeth, or cogs, from the cogs of the fpur- 

 wheel. The weight of four tons going down brings up about 

 one. 



The fpur-wheel, however, which is faftened to the break- 

 wheel, No. 2, fig. 5. is feldom ufed, as it is occafionully only 

 put in motion to regulate the ftretch of the ropes when new, 

 and to draw the light boat into the lock, when at any time 

 it may happen to be over-weighted with materials, fach as 

 mortar, props, flabs, &c. for the ufe of the higher level 

 collieries, and will not move of itfelf, upon a balance, out of 

 {he lower level. 



The length of the carriage, 6r cradle, is thirty feet ; its 

 F. J, width 



