Bow drill

The bow drill is an ancient form of drilling tool. It commonly was used to make friction fire, and in this function it also was called a fire drill. However, the same principle also was used widely in drilling for purposes of woodworking and dentistry.

单词	Pump drill
释义	Pump drill 英语百科 Bow drill The bow drill is an ancient form of drilling tool. It commonly was used to make friction fire, and in this function it also was called a fire drill. However, the same principle also was used widely in drilling for purposes of woodworking and dentistry.
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Pump drill

Bow drill