Bi Metallic Strip

To determine the co-efficient of absolute expansion of mercury. Glass tubes with vertical limbs contained within glass jackets approx. 460 x 25 mm height x diameter, 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 610 x 230 mm, height x width. Overall height 750 mm approx., supplied without mercury.

Fitted on a wooden base cast metal uprights and rod mountings. A 20-0-20 scale is provided to notice the expansion in rods. The counter weighted needle is used for easy reading. A knurling screw is provided for zero adjustment. Supplied with three metal rods one of each Aluminium, Brass and Steel.

To show different liquids have different thermal expansions. Five graduated glass bulb tubes are supported in a galvanized iron water trough by a support frame. Bulbs are of approx. 35 mm diameter with stem of 400 mm length.