 In the outer jacket, a liquid is placed, which boils at a temperature at least 30K than the substance under examination.A small quantity of glass-wool or asbestos pad covers the lower end of the Victor Meyer's tube to prevent breakage, when a glass bottle containing the substance under examination is dropped to it

The liquid in the outer jacket is heated until no more air escapes from the side tube.Then, a graduated tube filled with water is inverted over the side tube dipping in a trough filled with water.