Force Equilibrium Demonstrator (1885) This kit is a convenience tool for high school and college physics teachers in their teaching of forces and vectors. It includes a vertical force table on a stand to demonstrate the conditions for concurrent forces to be in equilibrium, a movable parallelogram to simulate the addition of forces, and a triangular support to show the type of force in each member of the support. Comes with 2 weight sets, a spring scale Qty :