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Lemma
beam compass
It is a compass used to trace large circles or arches or for measuring distances which are larger than those measured with a divider. It consists of only one straight leg (usually triangular in shape) where a point or a pencil is attached but able to slide. At one of the extremities, there is a fixed point to center the circles which are to be traced.
 
note:
 
italiano
compasso a verga
francese
compas à verge