What is the purpose of having a notch at the edge of a fire board?
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What is the purpose of having a notch at the edge of a fire board next to the spot where you are "drilling?"
Is this notch absolutely necessary? Could you obtain hot embers without this notch?
Remember the fire triangle?
Just as a triangle needs three sides to be a true triangle, a fire needs three things to be a fire.
You need Fuel, Heat & Oxygen to start a fire, or even a simple ember.
This notch supplies the oxygen to the heat & fuel. It also is the area where the hot dust collects together, forming the ember to start your fire.