Glass tubes with vertical limbs contained within glass jackets approx.460x 25 mm, are closed by bungs and fitted with inlet and outlet tubes. Upper ends of these vertical limbs are angled on emergence from the jackets to produce two short, adjacent limbs placed against a silvered glass scale 0 to 12 cm x 1 mm. Mounted on stand, supplied without mercury.

For the determination of the co-efficient of absolute expansion of mercury. The lengths of glass tubing with vertical limbs contained within glass jackets approx 460 x 25 mm height x diameter. Upper ends of the vertical limbs angled on emergence from the jackets to produce two short, adjacent limbs placed against a scale. Mounted on stand. Without mercury.