Langness dome ventilator

External_______________________Internal _________________________ Central cover not present when paraffin lamp was in operation

Center funnel + support _______________ dome rivets and external funnel

Dome ventilator Red lines shown because I am not sure if those parts are double skinned? Q3. What part of ventilator the outer and inner caps are ? And Where of these parts do rivetts pass through ? I think your Stoir Head drawing shows the parts