1 2 Book of Engineering 



Dorman, Long & Co., the celebrated bridge 

 builders of Middlesborough, being awarded 

 the contract. 



The most interesting feature of the New- 

 castle bridge is the fact that it produces, in 

 miniature, the wonderful structure which 

 Dorman, Long & Co. have so successfully 

 thrown across the huge harbour at Sydney. 

 The Tyne bridge is almost exactly a third 

 the span of the Sydney structure. The 

 former provides two lines for trams, four 

 for vehicular traffic besides two footways 

 of considerable width. 



The magnificent single-span arch is 

 approached by spans on either side of the 

 river which total 719 feet, the actual arch 

 of the bridge being 531 feet, and is, there- 

 fore, easily the largest arch in this country. 

 The greatest height of the arch is 170 feet 

 and the roadway is rather more than half 

 that height above the river level at high 

 tide. 



The steelwork of the structure weighs 

 about 8,000 tons, approximately half of it 

 going into the arch and the roadway which 



