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Though the sun's rays were hot for an hour or two in the morning, its genial influence was never felt in the wind. The air was never very dry, the wet-bulb thermometer standing during the day 3.75 degrees below the dry, thus giving a mean dew-point of 30.25 degrees.
He passed a current of air through a glass tube an inch in diameter, filled with moistened stones, and by that means succeeded in reducing the temperature of the current from 18° C. to 15° C.; and when the refrigerated current was directed against a wet-bulb thermometer, it fell to 14° C., thus showing a loss of 7°·2 F. of heat.
On one occasion, this drought was so great during the passage of a hot wind, that at night I observed the wet-bulb thermometer to stand 20.5 degrees below the temperature of the air, which was 66 degrees; this indicated a dew-point of 11.5 degrees, or 54.5 degrees below the air, and a saturation-point of 0.146; there being only 0.102 grains of vapour per cubic foot of air, which latter was loaded with dust.
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