Joined: Aug 2010
Posts: 4956
Sometimes hard to say
5/7/2018 at 10:41 PM
There were some old hay bales to the south of the yard and if they had been heating because they were tough it might of just been a situation of the really warm weather, a good supply of air because of the wind, and a bale that had gotten exceptionally warm.
Think that the term used for such events is spontaneous combustion, ragged soaked in linseed oil are a material that can ignite at a very low flash point.