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[Phys-l] jumping disc



Years ago Edmunds sold a tiny metal curved disc in the shape of a small
shallow "bowl" (? 1.5 cm diameter). I believe you pushed it the other way,
held it to warm it up, placed it on a table, and it eventually snapped
back into place upon cooling and "jumped" off the table (similar to the
rubber "poppers" sold today, which look like half racquet balls).

Does anyone know if there is a new manufacturer for these discs, or where
I might find them in surplus?