Link 5 with graduated dial a turns about fixed axis O. Link 3 with slot b is traversed by screw 1 which rotates about a fixed axis, parallel to axis Ox. Link 3 slides along fixed guides p-p. Link 4 with slot d is traversed by screw 2 which rotates about a fixed axis, parallel to axis Oy. Link 4 slides along fixed guides q-q. Link 5 is connected by a sliding pair to slider 6 which has pin f that slides simultaneously in slots b and d of links 3 and 4. The tangent of the angular displacement of link 5 is proportional to the ratio of the linear displacements x and y of links 3 and 4, traversed by screws 1 and 2, and is determined by the equation tan(ϕ)=y/x.
$2257$LS,MO$