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Product Information Unusual apparatus, named after Wilmaer Duff of Worchester Polytechnic, is a simple and inexpensive method of studying uniformly accelerated motion. It uses the isochronous 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 about a meter long, elevated at one end by a wood brace to form a very slight incline.  Tell a Friend about this item
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