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Guinea & Feather

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#780-1  Coin & Feather Apparatus, with a Plastic Tube (Guinea Feather Tube).  The cylinder is capped with a hard rubber closure at each end with a hose connector at one end for air evacuation.  When the tube is inverted, and the air is removed, the disc and feather will fall at the same rate because the feather does not meet any air resistance.  Overall length 47" #780 Coin & Feather Apparatus, with a Glass Tube (Guinea Feather Tube)