tramal is use to mark a distance
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"Trammel heads" are used to "scribe circles and arcs" that are too big to be drawn with a "compass or divider". Trammel heads can also be "used to bisect lines and angles". To draw lines of a fixed distance from an edge, they can be used as an option to both a marking Gage and a mortise Gage.
The trammel points are either on either side of an item or at a fixed range. A measuring device like a ruler checks the distance between the trammel points.
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