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The strap drill is a simpler version, where the bow is absent and the cord is kept taut by pulling the ends with both hands, while moving them left and right at the same time. In the absence of a frame, the thimble is shaped so that it can be held with the chin or the mouth.
Detail from The Extraction of the Stone of Madness, a painting by Hieronymus Bosch depicting trepanation (c. 1488–1516). Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [1] [2] is a surgical intervention in which a hole is drilled or ...
The set comes with a drill, driver, battery charger, carrying case, and two batteries. Get 50% off this bestselling drill set from Dewalt during Black Friday. The set comes with a drill, driver ...
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bow drill. Main article: Bow drill. An ancient tool usually used to make fire. It was also used for primitive woodworking and dentistry. bridgewire. Main article: Bridgewire. A relatively thin resistance wire used to set off a pyrotechnic composition serving as a pyrotechnic initiator. Bryant and May. Main article: Bryant and May
In archaeology, lithic technology includes a broad array of techniques used to produce usable tools from various types of stone. The earliest stone tools to date have been found at the site of Lomekwi 3 (LOM3) in Kenya and they have been dated to around 3.3 million years ago. [1]
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