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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.
==History==
Bow drills were used in Mehrgarh between the 4th and 5th millennium BC.〔 This bow drill—used to drill holes into lapis lazuli and carnelian—was made of green jasper.〔Kulke, Hermann & Rothermund, Dietmar (2004). ''A History of India''. Routledge. 22. ISBN 0-415-32920-5.〕 Similar drills were found in other parts of the Indus Valley Civilization and Iran one millennium later.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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