How much do you know maximum and minimum indicating thermometers?

Thermometer in use at ordinary times when most of these situations as a real-time field readings used, if you want to know about the thermometer have been to the highest or the lowest position, ordinary thermometer, there is no way to realize, unless someone remain observation, this way, in addition to spend a lot of manpower, the observed value is not correct, so today, to introduce the two kinds of thermometer is used to record a period of time has been to the highest or lowest temperature. The thermometer: dedicated to the determination of a certain period of time interval ( Usually a day) The highest temperature instrument. The structure of the thermometer and ordinary thermometer basic same, but in the mercury bulb neck to insert a small glass tube, or will be tight tube, when the temperature rises, the mercury, across the narrow neck rise, but when the temperature drops, the ball of mercury shrinkage, because the neck is narrow, the tube of mercury can't drop goal, then mercury hence at the neck of interrupts in the tube, so the top of the mercury column is shown in the temperature of the highest temperature for a time interval. The thermometer on the gallows in screen, horizontal cross, the ball on the left, top on the right. Minimum thermometer: dedicated to the determination of a certain period of time interval ( Usually a day) The lowest temperature instrument. Minimum thermometer for alcohol thermometer, within the minimum alcohol thermometer column, put a black index, long for a 2 cm at both ends of the spherical glass rod, when the temperature drops, alcohol contraction, surface tension of the alcohol pillars indicators move, namely to alcohol the ball back, when the temperature rises, alcohol column, and index because there was no driving force is still leave a place, so the index said end for one of the ball farther away from the alcohol in the lowest temperature within a certain time interval. Minimum thermometer placed in the screen inside the gallows, horizontal cross, the ball on the left, top on the right. So, this thermometer very good solve our team recorded the maximum and minimum temperature when a situation, and we often use the thermometer, one of the better introduction, feel useful? More knowledge of thermometer, please focus on the instrument.