Claim: A fire plough is a firelighting tool that produces ember due to friction and consists of a stick cut to a dull point and a long piece of wood.
Evidence: A fire plough (or fire plow) is a firelighting tool. Rubbing produces friction and heat, and eventually an ember. The typical fire plough consists of a stick cut to a dull point, and a long piece of wood with a groove cut down its length.