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Keywords: Stevenson screen interior.JPG Interior of a Stevenson screen showing from left to right the dewcell wet bulb with wick attached to water supply dry bulb and dry thermistor The metal pipe is called a psychrometer and sucks air across the thermometers Own 2005-07-26 CambridgeBayWeather CambridgeBayWeather Stevenson screen Measuring instruments humidity Measuring instruments temperature Dewcell |