Ontario Sessional Papers, 1906, . aume, Minister of Public Works, Ontario. Sir,—T have the honour to submit to you Part III. of the annual reportof the Highways Branch for the year 1905, with reference to bridge con-struction. I have the honour to beSir, Your obedient servant, A W. CAMPBELL Coinmissioner of Highways, (6) HIGHWAY BRIDGES. liridjre construction has passed throu^-li luuiicrous stages. One of theoldest types of permanent l;iidfie is the stone arcli, hrouf^jdit to ijicat perfec-tion by the ancient Homaus. A number of these built in Europe centuriesago are yet standing. Sto
Ontario Sessional Papers, 1906, . aume, Minister of Public Works, Ontario. Sir,—T have the honour to submit to you Part III. of the annual reportof the Highways Branch for the year 1905, with reference to bridge con-struction. I have the honour to beSir, Your obedient servant, A W. CAMPBELL Coinmissioner of Highways, (6) HIGHWAY BRIDGES. liridjre construction has passed throu^-li luuiicrous stages. One of theoldest types of permanent l;iidfie is the stone arcli, hrouf^jdit to ijicat perfec-tion by the ancient Homaus. A number of these built in Europe centuriesago are yet standing. Stone arches are still being built, but stone is givingphice to slccl. ccnient-concrete, and concrete reinforced with steel. A littleover a century ago, metal was first used in biidge building in l*>ngland. Castiron, and wrought iron have in turn h(d(l a prominent ])lace, but these havebeen displaced by structural steel, the material that has made thesky-scraping office, nieicantile and apartment buildings of the large Steel Bridge in Elgin County.—Span, 145 Feet; Width of Roadway, 16 Feet ; CoN( heteFlook, Concrete Ahitments ; Cost ok Ahitments, §3,600; Cost of Steel, |5,240 ; CostOK Concrete Floor, $ ; Gradinc;, $ ; Insiectiox, §70 ; Total Cost, $9, The principles of bridge design, whether in the case of wooden trusses,steel viaducts, stone or concrete arches, are more perfectly understood thanthey have ever previously been, and bridge structures in Canada are amongsome of the most noted the world has produced. The River St. Lawrence,the Niagara, and many chasms on the Canadian Pacific Railway in itsroute through the RocRy Mountains, are crossed by structures of great spanand remarkable i)erfection. Notable among these will be the railway bridgeacross the River St. Lawrence, seven miles west of Quebec, from the Chau-diere on the south side, to Cap Rouge on the north. The main span is tobe 90 feet longer than the central span in the
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