Force Board With Scales.

This low-cost alternative to the Force Table has an identical method of operation. It is ideal for graphing the composition of forces and the direction and magnitude of vectors. To use, link three spring scales together by a center harness and measure their corresponding angles and distances. Slide paper under the harness to mark the center, trace the position of the arms, and record each reading at the line. Includes: tempered masonite disc with 117 precision-punched holes; 3 spring scales; 3 aluminum clips for mounting scales; wire; instructions with operating procedures.