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In a variation called the Egyptian bow drill, the cord is wound around the shaft multiple times, or is fixed to it by a knot or a hole. [citation needed] 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 ...
A fire drill, sometimes called fire-stick, is a device to start a fire by friction between a rapidly rotating wooden rod (the spindle or shaft) and a cavity on a stationary wood piece (the hearth or fireboard).
Anatomy of a pistol-grip corded drill. Bow drill (strap-drill) are the first machine drills, as they convert a back and forth motion to a rotary motion, and they can be traced back to around 10,000 years ago. It was discovered that tying a cord around a stick, and then attaching the ends of the string to the ends of a stick (a bow), allowed a ...
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Eskimo hunter and polar bear slain with bow and arrow The cable backed bow, showing the bow (a) bearing the tensioned cable (b) along the face of it, attached by bindings (c). Finally, the bow strung with the main string (d). Spruce wood is nearly inelastic in compression, but usually the best available material for the belly of the bow.
A modern bow saw is a metal-framed crosscut saw in the shape of a bow with a coarse wide blade. This type of saw is also known as a Swede saw , bushman saw, Finn saw [ 1 ] or bucksaw . It is a rough tool that can be used for cross-cutting branches or firewood, up to a log diameter of half the blade length, limited by the height of the frame ...