t "5 J 

 convey to any part of the navigation wh* 

 they may be wanted, either for building, 

 or repairing of bridges, aqueducts, wharfs, 

 warehoufes, &c. the quarry is juft by the 

 mouth of the mine, and much is brought 

 out of the mine itfelf, in working for the 

 coals. Thus every part of the whole de- 

 fign acts in concert, and yields mutual 

 affiftance, which is the grand art ofceccno- 

 mical management; 



The great curiofity at Worjley is the 

 tunnel, which is a iubterraneous canal 

 hewn out of the rock to a great length (near 

 a mile,) and extends into the heart of the 

 coal mines. The view, Plate IX. exhibits 

 the mouth of it, and likewiie the quarry 

 works around it, 



A. The navigation* 



B. The mouth of the tunnel, with large 

 doors to open and fhut. 



C. The quarry. 



D. A crane of a very curious conftruc- 

 tion, for heaving the ftones out of 

 the quarry into the barges. 



E. Ropes that keep the crane in its per- 

 pendicular poiltion. 



The water in the tunnel is upon the level 

 of that in the canal, being the fame, fo that 

 the boats loaded with coals come out of the 

 very mine itfelf. 



The firft entrance, for one thoufand 

 vards, is fix feet and a half wide, and feven 



Vol. 311. Q for 



