Report upon the forestry investigations of the of agriculture1877-1898 . he turpentine is generally abandoned. Owing to the reduction in the quantity and quality of the raw product, resulting in a smaller yield of spiritsand of lowest grades of rosin, it is not considered profitable by the larger operators to work the trees for a longertime. In North Carolina the smaller landowners work their trees for eight to ten successive seasons and more,protect the trees against fire, and, after giving them rest for a series of years, apply new boxes on spaces left betweenthe old chips (reb
Report upon the forestry investigations of the of agriculture1877-1898 . he turpentine is generally abandoned. Owing to the reduction in the quantity and quality of the raw product, resulting in a smaller yield of spiritsand of lowest grades of rosin, it is not considered profitable by the larger operators to work the trees for a longertime. In North Carolina the smaller landowners work their trees for eight to ten successive seasons and more,protect the trees against fire, and, after giving them rest for a series of years, apply new boxes on spaces left betweenthe old chips (reboxing) with good results. Distillation.—The process of distillation requires experience and care in order to prevent loss in spirits ofturpentine, to obtain the largest quantities of rosin of higher grades, and to guard against overheating. Afterheating the still somewhat beyond the melting point of crude turpentine, a minute stream of tepid water from thetop of the condensing tub is conducted into the still and allowed to run until the end of the process; this end is Plate COST OF TUEPEI^TINE OECHARDlNG. m indicated by a peculiar uoise of the boiling contents of the still and the diminished quantity of volatile oil m thedistillate On reaching this point the heating of the still and the influx of water has to be carefully regulatedAfter all the spirits of turpentine has distilled over, the fire is removed, and the contents of the still are drawn offbv a tap at the bottom. This residuum, the molten rosin, is first allowed to run through a wire cloth and isimmediately strained again through coarse cotton cloth, or cotton batting made for the purpose, into a large trough,from which it is ladled into barrels. The legal standard weight of the commercial package is 280 pounds gross, no tare being allowed. , , j, r. ? i The finest -rades of rosin are largely used in the manufacture of paper, for sizing, oi soaps, and of fine varnishes;the medium qualities are mostly consumed
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
