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An engineer's trammel is a device similar in shape to a plumb bob. It is used a compass pivot when scribing circles and ellipses. A trammel is often used by metalworkers and carpenters when marking out radii on a work piece from a blueprint when an arc is too large to be drawn with a compass. Trammels can be used with a stick or metal bar to produce improvised compass.
A trammel may be used as an awl or scriber, to mark directly on wood or metal.
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