. Journal. tractionof the first crop of paraffin or hard scale has forlong been fully recognised, so far at least as naturalor atmospheric cooling is concerned ; but wheneverrefrigerator cooling has been used, the principle hasbeen abandoned. Mr. A. (. Kirk tells me that at Bathgate Works various schemes were ] iro-posed, and even partially worked out, for the coolingof paraffin oils in a state of repose, but these were put orating machines, made it seem not unreasonableto consider the possibility of cooling paraffin oils in anartificial winter atmosphere. When ways and meanscame to
. Journal. tractionof the first crop of paraffin or hard scale has forlong been fully recognised, so far at least as naturalor atmospheric cooling is concerned ; but wheneverrefrigerator cooling has been used, the principle hasbeen abandoned. Mr. A. (. Kirk tells me that at Bathgate Works various schemes were ] iro-posed, and even partially worked out, for the coolingof paraffin oils in a state of repose, but these were put orating machines, made it seem not unreasonableto consider the possibility of cooling paraffin oils in anartificial winter atmosphere. When ways and meanscame to be considered, it was evident that the employ-ment of tray coolers, one to two feet deep, was quitenut of the question, on account of the enormous groundarea that would be occupied for a given quantity ofoil, involving the erection and cooling of very largebuildings. The quantify of oil to be cooled at Oak-bank was 8000 gallons per day, and assuming thatfour days were necessary for cooling it, accommodation. aside in favour of the more rapid system of coolingby drums. At Oakbank, about two years ago, it becamenecessary to devise means for cooling and crystallisingcertain very viscous oils. An experience of manyyears with this class of oils made it evident thatproper crystallisation could only be ensured by coolingthe oil slowly, and in considerable mass, to thedesired temperature. The success of Mr. Colemanand others in maintaining a winter temperature in themeat safes of ships in the Tropics by means of refrig- for four days oil or 32,000 gallons would have to beprovided. This quantity of oil spread out in tanksone foot deep would cover a ground area of 5120square feet, equal to a rectangle of 160 feet by 32 the plans adopted and carried out at Oakbank,the coolers are turned edgewise, and are built inblocks with interspaces between the cells. It has beenpointed out that the cooled and crystallised, massneeds to be mashed orcrushed before it can be the flat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
