A simple bascule showing the advantage of a counterweight to balance the “seesaw” by moving the center of gravity at or very near the point of rotation. (Courtesy of Patrick McBriarty/PTM Werks)

A simple bascule showing the advantage of a counterweight to balance the “seesaw” by moving the center of gravity at or very near the point of rotation. (Courtesy of Patrick McBriarty/PTM Werks)