Page:A Practical Treatise on Brewing (4th ed.).djvu/102

86 weather, regulators are very seldom necessary, and may then be altogether withdrawn from the gyle-tuns, thus removing the possibility of any voltaic action from a mixture of metals. The regulators which we recommend are very simple, and may be made at a very trifling expense.

Pipes consisting of one metal only, and of three or four inches diameter, should be formed into a rectangular or circular vessel. This vessel must of course be water tight, and strong enough to resist any pressure which may occur. In one of the sides of this vessel two openings about one inch and a half or two inches in diameter, must be made about ten inches apart, and these fitted with screw-joints, to which flexible water-tight pipes may be attached, the one for admitting the cold water, the other for its discharge anywhere over the top of the square. This vessel, which in size must be proportioned to the gyle-tun, may be suspended from any beam above the gyle-tun, by means of a rope and pulley, so as to be let down into the worts, or withdrawn at pleasure. These will be found to answer the purpose intended as well as the most expensive instruments now in use, or perhaps even better. These regulators should only be allowed to descend a few inches into the body of the worts. We all know that liquids, generally speaking, as they cool, become specifically heavier, and thus the portions first cooled on the surface will sink down, while