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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 ...
Poplar wood, particularly when seasoned, makes a good hearth for a bow drill. Because of its high tannic acid content, the bark has been used in Europe for tanning leather. [4] Poplar wood can be used to produce chopsticks or wooden shoes. Baking moulds from peeled poplar may be used in the freezer, oven, or microwave oven. [18]
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 pump drill is a variant of the bow drill that uses a coiled rope around a cross-section of wooden stake spin the shaft by pumping up and down a cross-member. [16] [17] A fire plough (left), as opposed to a hand drill (right) The fire plough or fireplow consists of a stick cut to a dull point, and a long piece of wood with a groove cut down ...
The spindle and fireboard are typically made from dry, medium-soft non-resinous wood such as spruce, cedar, balsam, yucca, aspen, basswood, buckeye, willow, tamarack, or similar. [4] The Native American Indians along the western coast of the United-States traditionally made use of dead wood from the buckeye tree for preparing the fire-board. [5]
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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 user to drill quicker and more efficiently.
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. The point of the first piece is rubbed quickly through the groove of the second piece in a "plowing" motion, to produce hot dust that then becomes a coal.
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