he ME-9354 Variable "g" Pendulum doesn't, of course, actually allow you to vary the gravitational constant. But, by rotating the plane of oscillation of the pendulum, it does vary the component of gravity that acts to accelerate the pendu lum bob. A mathematical analysis shows that the motion in the plane of oscillation is exactly the same as for a standard pendulum, but with the gravitational constant g replaced by
g coscp, where cp is the angle through which the plane of
oscillation is turned.