Metropolis Water Supply. Plan and section of a line of aqueduct from the River Verulam above Watford to Primrose Hill for the supply of the districts on the north side of the River Thames. Artist/engraver/cartographer: Thomas Telford. Provenance: Ordered by the House of Commons to be printed. James and Luke G. Hansard & Sons, printers. Type: Antique engineering map and section.