It was considered dÃ©classÃ© to refer to one's own townhouses, estates or villas (or those of friends) as mansions and modern etiquette books still advise that the terms house, big house or great house be used instead.
Waste weir. A waste weir on a navigable canal is a slatted gate on each canal level or pound, to remove excess water and to drain the canal for repairs or for the winter shutdown.
Locks are elevators for boats, lifting and lowering them as they travel along the waterway. Today, there are 57 locks on New York's canal system, including 35 on the Erie Canal, 11 on the Champlain Canal, seven on the Oswego Canal, and four on the Cayuga-Seneca Canal.