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Trammel Head 33 Eclipse - No. 33.
Supplied as one pair of heads which, when mounted on a beam of suitable thickness, provide an efficient and convenient means of laying out the distance between two points and scribing arcs and circles.
Also known as a “beam compass”
For laying out the distance between two points
For scribing large arcs and circles
Use wooden strip off-cut minimum 10 mm thick x 38 mm wide
A pencil can be fitted in place of one pin