 He subsequently went into partnership with Jeffreys Parry de Winton and the firm developed as the Union Foundry.Manufactures included street gaslight columns and all manner of street furniture.When the Carnarvonshire Railway was being built under Castle Square, the tunnel roof was supported by iron beams supplied by De Winton's and their name can still be seen at the entrance to the tunnel, which is now used as a road underpass.