Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The author is of the opinion that the past litera ture relating to the absorption system of refrigeration is quite too fragmentary and technical to be easily pieced together or properly understood except by those who, through their own practical experience, are already well versed on the subject. While many have a good general knowledge of the compression refrigerating system, but few seem to have such a knowledge of the absorption system, due probably to the fact that simple, practical literature on the subject was not available.