SIX’S THERMOMETER (MAXIMUM/MINIMUM THERMOMETER)

  • Six’s thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours.
  • The thermometer indicates the current temperature and the highest and lowest temperatures since last reset.
  • Our thermometer consists of a U-shaped glass tube with two separate temperature scales set along each arm of the U. One for recording the maximum temperature and the other for the minimum temperature.
  • The range of the thermometer is -30° to +60°C x 1°C and -20° to +140°F x 2°F.
  • 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 spirit.
  • In the bend of the U, is a section of mercury, which is the indicator liquid.
  • The movement of mercury in the U-bend as a result of the expansion and contraction of spirit in both the limbs, forces the respective steel indices to move up along the column.
  • Readings are taken at the lower end of the indices, whose position can be reset by a magnet supplied along with the thermometer.
  • The entire set up is mounted on a plastic base.
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