Editing Newcomen atmospheric engine (section)

===Pumps===
Most images show only the engine side, giving no information on the pumps. Current opinion is that at least on the early engines, dead-weight force [[pumps]] were used, the work of the engine being solely to lift the pump side ready for the next downwards pump stroke. This is the arrangement used for the Dudley Castle replica which effectively works at the original stated rate of 12 strokes per minute/{{convert|10|impgal|l|abbr=off}} lifted per stroke. The later [[Watt engine]]s used lift pumps powered by the engine stroke and it may be that later versions of the Newcomen engine did so too.