A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . r it is cool;) or, the hop oil isdistilled over by means of the hood f, and condenser «, and is run off through the cock iifiij. 675. The cover D is then drawn up by the cliain and counter-weight. The extract isthen drawn off through the bottom cock j, and is added to the boil. The perforated plat-form is removed, and the vessel, which swings on the trunnions, is turned upside down andthe spent hops drop into a press. See Cooliriff.—The quicker worts a
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . r it is cool;) or, the hop oil isdistilled over by means of the hood f, and condenser «, and is run off through the cock iifiij. 675. The cover D is then drawn up by the cliain and counter-weight. The extract isthen drawn off through the bottom cock j, and is added to the boil. The perforated plat-form is removed, and the vessel, which swings on the trunnions, is turned upside down andthe spent hops drop into a press. See Cooliriff.—The quicker worts are cooled down to the fermenting temperature after beingboiled, the better. Tlie less it is to the action of the atmosphere the less liableit is to absorb oxygen, preventing acetous fermentation. 1066 VEGETABLE EXTRACT. Rapid cooling to all brewers is of vital importance, for if wort be permitted to comeinto contact with the air during the time its caloric is given off, aciditv must set in, espe-cially in summer time. The best method to cool worts is that which is shown and described in the drawingannexed, _^^. VENTILATION OF MINES. 1067 The worts are passed through copper tubes, thoroughly tinned. Instead of passing acurrent of water round these tubes, a dew jei of water is sprinkled all over the outer sur-f;ice, at the same time a current of cold air is brought into contact with the moist surface ofthe tube, so that as fast as the molecules of caloric are transmitted to the water through themetal tubes, they are blown away, giving place to others. By this process heat from liquidscan be abstracted more rapidly than by any other. In fact, worts can be brought down tofreezing temperature, although tho water used may be 80 to lUO Fahr. Another greatadvantage is, that the quantity of water used is about one-half. These tubes can be cleaned with a brush with perfect ease. VEXTILATION OF MIXES. In our subterranean operations, especially where quan-tities of carbon
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