The automatic determination of original gravity of beer. Part II. The determination of alcohol and gravity lost

Abstract

The determination of gravity lost on samples of sound beers by an automatic distillation procedure, followed by determination of alcohol in the distillate, is presented and discussed. The correlation between alcohol content and gravity lost, determined by distillation, is assessed, and the resulting relationship is used to determine gravity lost in a series of samples. Summation of results with those obtained in Part I indicates the accuracy of the determination of total original gravity by the method proposed, and is shown to be in agreement within ±2 units of original gravity with the distillation procedure; a mean standard deviation of 0·37 is obtained on replicate analysis.