APPENDIX. 547 



formed, one. on each side of the bridge, of a 

 double row of straight round bars, 2 inches 

 in diameter, and about 5 feet long each. 

 These bars, which we ma}' call its links, have 

 eyes in each of their ends to admit of cross 

 bolts 2 inches diameter; and to form a connec- 

 tion between any two of these links and another 

 succeeding pair, similarly formed, there are three 

 small equal square links passing round the 

 ends and middle of the cross bolts. 



This mode of coupling, which is represented 

 by the joint A in the figure above, and is a 

 rude imitation of that of the Menai Bridge, is 

 used through the whole chain, except in the 

 last joint near to its termination in the masonry. 

 At this last place, however, instead of the three 

 small links, as at A, there was a single link, 

 D E, of about equal strength to all the three, 

 3 J inches broad; this link was fastened at the 

 end E to a large plate of iron at the back of 

 the masonry, and was connected at D by the 

 bolt BC to the two main links of the chain 

 represented above and below D, which it passed 

 between, and the centers of which links were 

 3z2 



