. The principles of fruit-growing. Fruit-culture. 130 The Principles of Fruit-growing. /R !' of cold produced by evaporation. Suppose the dry bulb marks 65° F., and the wet bulb 56°, then 65° — 56° = 9°, or the cold produced by evapora- tion. This swinging and reading of the pyschrom- eter are done in the shade in the open air when the temperature of dew-point is sought; it should be done rapidly and the ther- mometers read promptly The dry-bulb gives the temperature of the open air, and dew-point is de- termined by reference to tabulated ; A com- mon form of psychrometer is shown
. The principles of fruit-growing. Fruit-culture. 130 The Principles of Fruit-growing. /R !' of cold produced by evaporation. Suppose the dry bulb marks 65° F., and the wet bulb 56°, then 65° — 56° = 9°, or the cold produced by evapora- tion. This swinging and reading of the pyschrom- eter are done in the shade in the open air when the temperature of dew-point is sought; it should be done rapidly and the ther- mometers read promptly The dry-bulb gives the temperature of the open air, and dew-point is de- termined by reference to tabulated ; A com- mon form of psychrometer is shown in Fig. 11, but inasmuch as this has a cup of water connected with the wet-bulb, it is not so handy for whirling. Such an instrument may be fanned instead of whirled. Hammon gives the fol- lowing directions and fig- ures for determining the dew-point: " To obtain the dew-point from the wet-and dry-bulb hygrom- eter or psychrometer, moisten the muslin on the. 2Tig. 11. One form of wet- and dry bulb Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan
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Keywords: ., bookaut, bookcentury1800, bookdecade1890, booksubjectfruitculture
