Link 3 slides in fixed guides a-a. Link 2 slides in fixed guides b-b. Cross-shaped slider 1 moves simultaneously along two guides, c and d, of links 3 and 2. The axes of guides c and d are perpendicular to each other. If point 0, the tail of vector 0͞A, is given together with coordinates x and y of its head, the mechanism determines the magnitude of vector 0͞A as the geometric sum of the displacements x and y of links 2 and 3 in guides b-b and a-a, i.e. the quantity 0͞A=sqrt(x²+y²).
$1297$LG,MO$