初步测定已知浓度溶液在加热时从浑浊变为清澈，冷却时从清澈变为浑浊时的温度。将两种浓度相同的溶液（一种较冷且浑浊，另一种较热且清澈）置于槽中，在初步确定的温度下进行控制，并注意到它们在温度平衡时的外观。在不同温度下重复该试验，直到透明溶液保持透明，溶液保持浑浊。

Preliminary the temperatures are determined at which solutions of known concentration change on heating from being cloudy to clear and on cooling from being clear to cloudy. Two solutions of the same concentration, one being colder and cloudy and the other being warmer and clear, are placed in a bath, controlled at a preliminary determined temperature and their appearance at temperature equilibrium is noted. The test is repeated at varying temperatures until the clear solution remains clear and cloudy solution cloudy.