Sentence:  [T]he Contract with the Pipe-water Pavior was, as he recollects, to keep the Pavement in Repair for ſix Weeks; did oblige the Contractor to repair many Places in that ſix Weeks; there was a Part of the new <WSD>Main</WSD> failed in "Dame-ſtreet"; was obliged to take up three or four Pieces in Length, in conſequence of a Sewer being made there, which undermined the <WSD>Main</WSD>, and put it out of its Place; ... 
Meaning of the word marked with <WSD> tags:  A large cable or pipe providing utility service to an area or a building, such as a water main or electric main. (from 17th c.)