. THE FINE ARTS. 295 



and trebled according to size, as well in the quarry- 

 ing as in the carriage and setting.* 



Menai Bridge at Bangor Ferry. 



The span of this hanging arch is 580 feet; depth 

 of the arch, 50 feet ; height of the pillars above the 

 roadway, 53 feet ; height of the roadway above the 

 level of high water, 100 feet, so that vessels may sail 

 under the bridge. The base of the pillars is founded 

 on a rock near the level of low water, so that from the 

 base to the top of each suspending pillar is 160 

 feet. 



The chains are bent over the pillars at the same 

 angle with which they hang on the arch, and take the 

 ground about 380 feet on each side of each pillar, 

 where they are bent at an angle, and carried in a 

 sloping direction forty feet into a square tunnel, 

 driven out of the solid rock, at the bottom of which 

 they are made fast to strong cast iron plates, butting 

 against the rock. 



Highest Edifices. 



Feet. 



Pyramid of Gizeh 543 



Steeples of the Cathedral at Cologne . . 501 



Steeple of the Minster at Ulm . . . . 481 



Cathedral at Antwerp . . 476 



Minster at Strasburgh . . 486 



Pyramid of Cheops 452 



Cupola of St. Peter's at Rome . . . . 431 



St. Paul's at London . . . 347 



the Jesuits' Church, Paris . . 314 



the Invalids, Paris .... 295 



* M. Dupin calculates, that the combined action of the 

 steam-engines now at work in Britain, could raise from the 

 quarries, and place as they now are, all the stones of the great 

 Pyramid in eighteen hours. 



