. Better fruit. Fruit-culture. Page 36 BETTER FRUIT Novcuiber style of psychrometer is shown in Figure 5. It consists of two sensitive thermometers, mounted upon a com- mon back having a swiveled handle bv removable floor and louvered sides. Such a shelter can be constructed by anyone familiar with the use of car- penter's tools. It is painted white. Fic. 5- SLING PSYCHROMETER which it may be whirled. The bulb of one of the thermometers is wrapped in clean muslin. In taking an observa- tion the muslin is thoroughly wet and the instrument rapidly whirled. As soon as the moisture on the wet bulb
. Better fruit. Fruit-culture. Page 36 BETTER FRUIT Novcuiber style of psychrometer is shown in Figure 5. It consists of two sensitive thermometers, mounted upon a com- mon back having a swiveled handle bv removable floor and louvered sides. Such a shelter can be constructed by anyone familiar with the use of car- penter's tools. It is painted white. Fic. 5- SLING PSYCHROMETER which it may be whirled. The bulb of one of the thermometers is wrapped in clean muslin. In taking an observa- tion the muslin is thoroughly wet and the instrument rapidly whirled. As soon as the moisture on the wet bulb begins to evaporate the wet thermome- ter will show a lower temperature than is indicated by the dry thermometer. The drier the air is the gi-eater will be the difference between the readings of the two thermometers. By means of tables that have been prepared the dew- point can be determined from the read- ings of this instrument. The best of instruments will not give accurate results unless properly exposed. It is a mistake to suppose that a thermometer always gives the temperature of the air by which it is surrounded. The temperature shown by any other thermometer is the tem- perature of the thermometer itself. When the thermometer is protected from the direct or reflected rays of the sun and from excessive radiation to the open sky, is remote from any source of artificial heat and is where the air can circulate freely about it its temperature will be substantially that of the air, and therefore its read- ings will be accurate. When it is exposed to the direct or reflected rays of the sun its temperature will be higher than that of the air, as will also be the case when it is near some source of artificial heat. WTien it is freely exposed to the open sky at. 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
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Keywords: ., bo, bookcontributorthelibraryofcongress, booksubjectfruitculture
