400 



MENAI BRIDGE. 



The chain is attached to a moveable saddle 

 lying on the top of the pillar, the tension of 

 its top link on both sides of the pillar is therefore 

 the same. The utmost tension which the chain 

 might be expected to bear in the direction of 

 its length, is 7020 tons; for a section of all 

 the cables composing it, is 260 square inches, 

 and the strength of a square inch bar of iron, 

 may be estimated at 27 tons. 



Let AC and AE be in the direction of the 

 top links of the chain, AB and AD horizontal, 

 BC and DE vertical. 



Then, if we suppose the bridge to retain its 

 present form, and to be loaded with the utmost 



