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Lemma
triangular compass
It is a compass used to copy drawings and plans without modifying the scale, characterized by the presence of a third leg in addition to the two standard legs. Starting from any three points on the original, successive points are transferred one at a time: to maintain the orientation, it is necessary that two points have been copied in advance. It is essentially used in technical drawing.
 
note:
 
italiano
compasso a tre bracci
francese
compas triangulaire