Comprising a glass U-tube 50cm long x 1cm dia. mounted on one side of the stand. Hare’s apparatus consisting of a three limbed tube, the central limb fitted with rubber tubing and Mohr clip and the two outer limbs connected to glass tube 41cm long x 1cm dia. mounted on the other. Scale 0 to 500x1mm or length x width, fixed to each side of the stand. Overall height 55cm.