Page:A Practical Treatise on Brewing (4th ed.).djvu/201

Rh Wednesday, 6 —The light yeasty head just beginning to drop, heat 66°, attenuated to 18 lbs.; added 6 lbs. of yeast rising in the pail. 11 —Rising to a ﬁne close yeasty head and all right. 3 —All right, heat 72°, attenuated to 12 lbs. cleansed; ﬁll up as before directed, and when done working in the casks, the ale will be down to 9 lbs. gravity.

In all healthy sound fermentations, allowance must be made when cleansing for the additional attenuation in the cleansing casks.

We must now calculate what number of lbs. gravity we have obtained per quarter from the malt.

The rule for the quantities to be turned out of the copper, so as to produce the required number of barrels in the gyle-tun, as described in the foregoing process, if the copper be truly and rightly gauged, will always approximate nearly enough to the truth for practice, making allowance for the difference of evaporation on the coolers, according to the state of the atmosphere. If more than the usual evaporation takes place, the quantity will be less, but the worts will be proportionally stronger, and vice versâ.