...evaporation proceeds from the wet bulb, the temperature is lowered in proportion to the dryness of the air : if the air is saturated with moisture, there will be no difference between the readings of the two thermometers ; but if the air is very dry, the difference...

...less than the dry one. The amount by which the wet buIb is lowered depends on the moisture present in the air. If the air is saturated with moisture, there will be no difference, while if the air is dry, there is a large difference in the temperatures recorded by...

...psychrometer in the air will cause little or none of the moisture on the wet oulb to evaporate, and there will be little or no difference in the readings of the two thermometers. The readings of the thermometers (the difference in which is sometimes termed the depression) should...