This unusual apparatus, named after Wilmer Duff of Worchester Polytechnic, is a simple method of studying uniformly accelerated motion. It uses the iso- chronous oscillation of a ball rolling back and forth in a cylindrical trough as a time marker. It consists of a stiff plastic trough, bright red in color, 1 m long, elevated at one end to form a very slight incline. The fact that a ball is rolling down the incline, instead of a sliding block, changes the mathematical workup performed in most physics lab today. The path of the ball crosses the midline of the trough at equal times, yielding information about the position of the ball as a function of equal time intervals. Includes: 3/4? steel ball, instructions, curved plastic track, wood support at one end. You need cork dust or chalk powder. Made in USA
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