Specification of William Henry Gummer : stench trap.

A section through the roadway of Holborn Viaduct, London: looking east, showing the middle level sewer. Wood engraving after W. Haywood, 1854.

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Specification of William Henry Gummer : stench trap.

A section through the roadway of Holborn Viaduct, London: looking east, showing the middle level sewer. Wood engraving after W. Haywood, 1854.