. Appleton's dictionary of machines, mechanics, engine-work, and engineering. l is as great as with common ket-tles. These kinds of vacuum-pans require a great quantity of fresh water for condensing; and in placeswhere water is scarce, vacuum-pans of this description cannot be employed. Degrands apparatus.—Degrands system consists of a condenser. The vapors arising from the juiceor syrD boiled in a vacusm-pan and condensed by means of a serpentine tube, over which a film of coldjuice is continually kept flowing, which absorbs the latent heat of the vapor within the tube, and a por-tion of the
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. l is as great as with common ket-tles. These kinds of vacuum-pans require a great quantity of fresh water for condensing; and in placeswhere water is scarce, vacuum-pans of this description cannot be employed. Degrands apparatus.—Degrands system consists of a condenser. The vapors arising from the juiceor syrD boiled in a vacusm-pan and condensed by means of a serpentine tube, over which a film of coldjuice is continually kept flowing, which absorbs the latent heat of the vapor within the tube, and a por-tion of the water from the juice passes off as vapor in the air. Degrands condenser serves the doublepurpose of a condenser and evaporator. There are only two of Degrands apparatus in Louisiana. They were constructed at the NoveltyWorks, New York, and are more commonly known as Derosnes apparatus; but Mr. Degrand is thereal inventor and patentee of this apparatus, and Derosne & Cail are only the constructors and assigneesof his apparatus for the north of France and the The Degrand apparatus in operation in Louisiana have vacuum-pans with a very large heating sur-face, and heated with low-pressure steam; the air-pumps are larger than those used in the Island ofCuba. The artificial draught of air is not made use of here, but the same result is obtained by the in-jection of water between the condenser and air-pump; this increases somewhat the consumption of fuel,but the vacuum obtained in that way is as perfect as by means of the draught of air ; and the sugarmade with this apparatus is as good as any made in Louisiana. In the beet-sugar manufactories in Oermany the manufacturers were beginning to abandon its use, inconsequence of the practical difficulties in distributing the beet-juice regularly over the serpentine; andin case one of the many tubes which form the serpentine has the slightest deviation from the straightline, the juice will concentrate more at such depressions, a
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
