The most widespread source of ignition was friction through the use of a fire-drill or saw. In such systems a small area is subjected to abrasive friction and heats to form a hotspot, thermal transfer may then occur from the hotspot to the system. In the case of the fire drill, friction between the drill tip and the fire-board causes the formation of a hot charcoal-like dust. When this hot dust is added to the dry tinder and blown the tinder may burn.

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