Here are two links for pictures of a Newcomen steam engine probably very similar to the furnace one. Built about the same year.
https://www.ashton-under-lyne.com/history/fairbottombobs.htm
https://technology.niagarac.on.ca/staff/mcsele/newcomen.htm
https://www.ashton-under-lyne.com/history/fairbottombobs.htm
https://technology.niagarac.on.ca/staff/mcsele/newcomen.htm