GUINEA AND FEATHER APPA'RATUS (0075) Demonstrates that the objects fall at the same rate of acceleration in vacuum under the effect of gravity irrespective of their relative weights and sizes. Consists of a thick-walled glass tube fitted with rubber bungs at each end to seal the tube. One of the rubber bungs has a glass tube of about 8mm diameter fixed through hole in it that has rubber tubing with clip for connecting it to vacuum pump Qty :