THERMOMETERS & REMOTE SENSORS ARE HOUSED IN A STEVENSON SCREEN. THE SCREEN KEEPS DIRECT SUNSHINE OFF THE THERMOMETERS, THOUGH THE LOUVRES ENSURE FREE CIRCULATION OF AIR. THE YELLOW THERMOMETER KEEPS A RECORD OF THE DAILY MAXIMUM TEMPERATURE REACHED. BELOW IT,THE MINIMUM DOES LIKEWISE FOR THE LOWEST TEMPERATURE REACHED. BOTH ARE RESET ABOUT 0900Hrs EACH DAY. THE LOWEST THERMOMETER PROVIDES THE INFORMATION TO CALCULATE THE HUMIDITY& IS CALLED A WET BULB THERMOMETER.
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