14 Book of Engineering 



the two arms approached each other. until 

 they could be joined. 



One of the greatest bridges erected in 

 recent years is that which spans the harbour 

 of Montreal. Four million pounds has been 

 spent on the bridge. The biggest liners 

 can pass under it quite easily, whilst its 

 floor accommodates four lines of vehicular 

 traffic, provides side walks for foot pas- 

 sengers, and two tramway tracks are also 

 arranged on the outside of the central 

 vehicular road. Two main piers carry the 

 principal span, which is no less than 1,097 

 feet, with a height of 162 feet above water 

 level at the highest point of the tide. This 

 portion is a cantilever structure with two 

 42O-feet anchor arms. Thirteen steel towers 

 and two masonry piers carry the rest of the 

 bridge. There are many steel spans over 

 that portion of the St. Lawrence which is 

 shallow and not used for traffic; these 

 vary from 90 to 245 feet in length. 



The Montreal Harbour Bridge is one 

 of the world's greatest, whether considered 

 from the point of view of importance or 



