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| image title | Six's maximum and minimum thermometer |
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| caption | Six's maximum and minimum thermometer registers both the maximum and the minimum temperature in a single device. The temperature is sensed by a bulb filled with clear spirit, mounted at the top of one limb of a U-shaped capillary. Round the bend of the U the capillary is filled with a second, more viscous liquid (sometimes mercury, sometimes a coloured liquid) that does not mix with the spirit. Spirit in the capillary is in contact with this second liquid and scales are arranged so that the expansion of the spirit in the bulb can be read at either end of the second liquid. Temperature increases downwards on the bulb side and upwards on the other. Two pins in the capillary are pushed upwards by the second liquid but their size is designed to prevent them being dragged downwards. See also Maximum thermometer and minimum thermometer, MI007. |
| code | MI008 |
| Section | Meteorological instruments |
| Subsection | Surface-based instruments |
| image credit | © The Open University |
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| Creator: Guest user Created: 19 September 2020 04:12:42 |