该方法包括煮沸稀释或未稀释的试验部分，并将收集在刻度管中的油蒸汽夹带；冷却后，直接从该管中读取从脱盐中分离出的油的体积。

The method consists in boiling a test portion, diluted or undiluted, and steam entrainment of the oils which are collected in a graduated tube; after cooling, direct reading from this tube of the volume of the oils separated from the destillate.