METHOD AND APPARATUS FOR EVALUATING RETENTION TIME OF FOAM OF BEER

摘要

A method of evaluating the retention time of foam on each of the glasses containing different kinds of beer with the same thickness of foam. The method comprises the step of pouring a certain quantity of beer into glasses from a tap of given height to take samples having a predetermined reference thickness of foam, measuring the thickness and retention time of foam of each sample, comparing the measured thickness with the reference thickness, adjusting the tap heights to bring the measured thickness of foam to the reference thickness, pouring the same quantity of the same beer into the glasses again to take new samples, and measuring the thickness and retention time of foam of each sample; and the step of reading the retention time of foam corresponding to the reference thickness of foam from a graph plotted on the basis of data of the absolute retention time of foam obtained from the samples taken by the repetition of the first step.