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Comprising two cast metal end pieces joined together by three nickel plated rods and carrying two sliding V-supports for a glass jacket with inlet and outlet tubes.Terminals are also fitted for electricl circuit to indicate the moment of contact of centre tube and spherometer. Comprising of cast iron supports joined by two rods which carry two sliding supports for glass jacket with inlet and outlet tubes. One endpiece fitted with spherometer reading to 0.01 mm and the other with contact screw. The glass jacket encloses both brass and aluminium rod fitted through corks, a half turn of the jacket changing rod in contact with the spherometer. Thermometer can be attached to either of the rods by rubber bands. Terminals are fitted to apparatus for electrical circuit to indicate the moment of contact of centre tube and spherometer. Supplied with one each of copper, brass and iron expansion rods.