a cone of tin painted black and decorated with gold motif, suspended by two pins let into two brass rods which are fixed to a circular brass base. The cone is free to swing and hangs naturally point downwards. Demonstration of points of gravity.
plastic base with 4 brass terminals in a line. Each terminal is high up and has a large brass arm attached. One arm has a Morse code style tapper at the end and is poised over a plastic stand. Stamped in the corner of the base is "Univ. Abdn., Nat.…