Allez-y voir.

https://theconversation.com/notre-dame-de-paris-comment-se-met-en-place-le-terrible-triangle-du-feu-115666?utm_medium=email&utm_campaign=La%20lettre%20de%20The%20Conversation%20France%20du%2017%20avril%202019%20-%201288111982&utm_content=La%20lettre%20de%20The%20Conversation%20France%20du%2017%20avril%202019%20-%201288111982+CID_a9a4cca6833bebbeb9fc2a6557c4c212&utm_source=campaign_monitor_fr&utm_term=Notre-Dame%20de%20Paris%20%20comment%20se%20met%20en%20place%20le%20terrible%20triangle%20du%20feu