Dear Alex
Prof Annegarn looked at the video (he is very experience in measuring bush fire particulates) and agreed that the fire zone is very small inside, and it is a great demonstration of the length through the centre of a vortex that the flames can travel when spinning, even around corners. I see they stopped being interested in putting out the fire, it was so beautiful. Regards Crispin Can we call it an invisible chimney? Alex
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