Question

What is maximum-minimum thermometer?
Describe its features in your own words.
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Answer 1

Explanation:

Six's maximum and minimum thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a períod of time, for example 24 hours

Answer 2

Traditionally maximum and minimum temperatures were measured using the set-up . Now many weather stations are equipped with electronic instruments. However, there are still many cooperative weather stations using “mercury-in-glass” thermometers. These thermometers, like the lower thermometer above, are mounted on a Townsend Support which places each thermometer in the proper alignment to measure the high (maximum) and low (minimum) temperatures.

The minimum thermometer, on top, uses red colored alcohol as the measuring fluid. Alcohol has a freezing point of -173 degrees F which is much lower than mercury’s -37.9 degrees F. The Townsend Support holds the thermometer tilted down slightly to the left. Inside the tube is a black index which always marks the lowest reading since it was last reset. The index allows alcohol to move past when the temperature warms rises. When the temperature cools the surface tension of the alcohol drags the black index down. Once the temperature reaches its lowest point and begins to warm the alcohol moves up the scale again allowing the marker to remain in place, marking the lowest reading. To reset the thermometer the observer tilts it down to the right and the black index moves down the tube stopping at the current