A six's thermometer is used to find out the maximum and minimum temperature in a day. It gives three readings, the current temperature, the highest temperature reached since it was last reset, and the lowest temperature reached since it was last reset. It consists of a U-shaped glass tube with two separate temperature scales set along each arm of the U. One of these is for recording the maximum temperature encountered and the other for the minimum temperature. The arms of the U-shaped tube terminate in sealed glass bulbs. The bulb at the top of the minimum reading scale arm is full of alcohol, the other contains a vacuum.
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