A geometric angle drawn on a plane and used as a constant proportional relationship for enlarging measurements with compasses.
Triangolo is documented by Le voci del marmo as an angle drawn on a plane and used as a constant proportion for enlarging measurements when working with compasses. Because the angle remains constant as its sides extend from the vertex, corresponding spans can be used to generate proportional enlargement.
Etymology
Italian triangolo, “triangle”; here used as a proportional construction.
Sculptor Notes
This is a beautifully simple analogue enlargement system: scale is generated geometrically rather than by calculating each dimension separately.
References
https://levocidelmarmo.sns.it/scheda_oggetti_relazione.php?denom=triangolo&id=57