. The culture of flue-cured tobacco. Tobacco. 32 BULLETIN 16, TJ. S. DEPARTMENT OP AGRICULTURE. it is highly desirable that the barn be so arranged as to be fully and freely ventilated, so that it may be possible to steadily remove the warm, moisture-laden air as it becomes saturated. In drying out an ordinary 16-foot or 18-foot barn, holding say 500 sticks of cut tobacco, about 5,000 pounds of moisture (water) must be removed. The movement of the air through ventilation is the only means of getting rid of this large amount of moisture. Raising the temperature of the air increases its capacity
. The culture of flue-cured tobacco. Tobacco. 32 BULLETIN 16, TJ. S. DEPARTMENT OP AGRICULTURE. it is highly desirable that the barn be so arranged as to be fully and freely ventilated, so that it may be possible to steadily remove the warm, moisture-laden air as it becomes saturated. In drying out an ordinary 16-foot or 18-foot barn, holding say 500 sticks of cut tobacco, about 5,000 pounds of moisture (water) must be removed. The movement of the air through ventilation is the only means of getting rid of this large amount of moisture. Raising the temperature of the air increases its capacity to absorb moisture and creates a draft, provided means are afforded in the construction of the barn for letting out the air rapidly at the top and for letting it in at the bottom. For the outlet at the top a short lever device at each end of the peak for raising the ridgeboarcl by means of wires. Fig. 11.—A good type of flue-curing tobacco barn, showing the ridgepole ventilator raised. The mouth of one of the bottom air inlets is seen just under the open door. reaching to the ground, as shown in figure 11, is a handy and simple arrangement. The slit left open when the ridgeboard is raised should be about 5 inches wide. To admit air at the bottom there is always the door, which can be partially opened at will; but this method gives an excess of air immediately in front of and over the door. For an even distribution of the air in all parts of the barn, sewer pipes, about the 4-inch, size, set in the wall at appropriate places, will make a good arrangement for the bottom ventilation. The pipes should be set in the wall close to the ground, but just above it on the out- side'; they should dip just below the ground on the inside, the open- ings of the different pipes being, respectively, under and near the end and at the middle of each length of flue, including the returns. Each air pipe should be fitted on the outside with a suitable wooden. Please note that these images are ext
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttobacco, bookyear1913
