Meteorology · Instruments — Psychrometer
A sling psychrometer measures humidity using:
- AA single dry thermometer
- BAn anemometer
- CA barometer
- DWet-bulb and dry-bulb thermometers, whose difference gives relative humidity and dew point✓ Correct
Explanation
The psychrometer compares the dry-bulb (air) temperature with the wet-bulb temperature (cooled by evaporation); the depression between them, via tables, yields relative humidity and dew point.
Authority: Bowditch (Pub. No. 9), meteorological instruments
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