Bulletin . e flowage; the working efficiency is, however, not perfect, and thevacuum pump is operated all the time. The condensing water isusually allowed to go to waste, but at some plants a use is found forit, such as dissolving the salt underground. Its temperature is low,80° to 90° F., so that not much heat is lost, and it is usually brackish. The vacuum in the body of a single effect, measured in inches ofmercury, ranges from 25 to 28 inches. At one plant where tripleeffects are used the vacuums in the first, second, and third effectswere 15, 24, and 27 inches, and at another 14, 18 to 20
Bulletin . e flowage; the working efficiency is, however, not perfect, and thevacuum pump is operated all the time. The condensing water isusually allowed to go to waste, but at some plants a use is found forit, such as dissolving the salt underground. Its temperature is low,80° to 90° F., so that not much heat is lost, and it is usually brackish. The vacuum in the body of a single effect, measured in inches ofmercury, ranges from 25 to 28 inches. At one plant where tripleeffects are used the vacuums in the first, second, and third effectswere 15, 24, and 27 inches, and at another 14, 18 to 20, and 28 inches,the water in the effects boning at correspondingly low aim is to maintain in the last effect a vacuum as nearly perfectas practicable. As the degree of exhaustion decreases progressivelyfrom the last to the first effect the brine boils at the highest temper-ature in the first effect and at increasingly lower temperatures in theothers. BUREAJ of MINES BULLETIN !46 PLATE XVI. BUREAU OP MINES BULLET
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