two water lifting machine at Gresham Street (GHT00) 1)possibly the one built in about AD63, was a chain of buckets operated by a simple treadwheel (it may have been operated by a geared shaft that was powered by animals) 2)Ironwork found in the cistern formed part of a sturdy bucket chain mechanism from AD110, similarity with Vitruvius one as a double iron chain (duplex ferrea catena). the ironwork suggest that the system was operated either by man power or animal power.