3-034-807 - The Print Collector/Heritage Images

Holborn Valley Viaduct [in London]: section of subway on each side, 1871. 'In the construction of the Viaduct and the streets connected with it the Corporation of London determined to introduce subways for gas, water, and telegraph pipes, and thus to prevent the breaking up of the road surface...The conveyance of gas...requires special arrangements for ventilation to prevent the risk of explosion, and the subways under the Viaduct are believed to be the first constructed with a view to their safety when used for this purpose...there is a subway, 7 ft. wide and 11 ft. 6 in. high, on each side of the road, running between the great arches which carry the roadway and the house vaults which support each footway. The subways are immediately above the sewers...In each subway a 14-inch main pipe of the New River Company is carried by iron chains near to the wall nearest the frontage of the houses, and above it 10-inch gas mains, belonging to the City of London and Great Central Gas Companies, are supported on iron brackets projecting from the wall; on the opposite side of the subway a pipe containing the telegraph wires is carried in a similar way'. The Holborn Viaduct was designed by William Haywood, 'engineer of the Commissioners of Sewers'. From "Illustrated London News", 1871.