Centroid Finder (print-in-place)

This device can find the center of gravity of a triangle.
When the three large holes are moved to each vertex of the triangle, the small hole in the center indicates the calculating.
This device consists of two linkage mechanisms, which are called the pantograph. Each pantograph has the function of didividesgle's center of ga ravity1:1 and 1:2, which calculates the center of gravity from the coordinates of the triangle's vertices.