Give a reason why a Stevenson screen is ventilated. 1890 - … Why is alcohol used in measuring temperature of very cold countries? The highest number will be the maximum, the lowest the minimum, and the current temperature will be somewhere in between. the thermometer contains mercury which moves up or down based on the It indicates current temperature along with the highest and the lowest temperatures since it was last set. When the temperature We encourage the use and reuse of our collection data. [2], The thermometer shows a reading at the top of the mercury section on both the maximum and minimum scales; this shows the current temperature and should be the same on both scales. If it falls, the moving mercury will push the minimum scale marker. It is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. £8.49. One side 4. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. Six’s maximum and minimum thermometer. The thermometer consists of a U-shaped glass tube with two separate temperature scales set along each arm of the U. Digital Display Max Min Greenhouse Thermometer Garden Indoor Outdoor Wall Room. with the help of a diagram. Its purpose is to read themaximum and minimum temperatures reached since thethermometer was last read. Apparatus Description: The six’s thermometer consists of a U-shaped capillary tube with the bulbs at both ends; The bend of the U shaped-tube is filled with mercury The bend at the bottom of Six’s Maximum and Minimum Six's maximum and minimum thermometer Details Category: King George III Object Number: 1927-1732 Materials: alcohol, cork, glass, mercury, pine and steel credit: King's College, London Cite this page. Six’s maximum and the minimum thermometer is mainly used for measuring the maximum and minimum temperature of the particular day. Temperature Range: -20 to 50°C&F Accuracy: +/-1°C IP Rating: IP 65 Battery: 1 x AAA (Supplied) Product Dimensions: 203 x 100 x 30mm This a very popular and reliable thermometer for monitoring maximum and minimum temperatures. The bend of the U-tube is filled with mercury. The maximum and minimum readings are recorded by two small steel markers which are sprung into the capillary tube so that they can slide, but only if a force is applied to them, either by being pushed by the mercury or under the influence of an external magnet. It's purpose is to record maximum and minimum temperature , since it was last read. Generally speaking a minimum temperature occurs during the night and a maximum during the day. The vacuum in the other bulb allows free movement of the alcohol and mercury. JAMES SIX invented the Maximum and Minimum thermometer in 1782. £13.15. The markers thus record the furthest point reached by the mercury in each arm of the tube, and thereby the highest and lowest temperatures since the last reset. It is used to record extreme temperatures at a location as in meteorology, horticulture etc. It was invented by a British scientist James Six, born in Canterbury, in 1780; the same basic design remains in use. thermometer is a U shaped parallel tube made up of glass. To bring them back into contact with the mercury, they are simply dragged back into the capillary tube by means of a magnet. registers the maximum temperature and the other side records the minimum Another design has the U orientated horizontally and the markers completely free and unsprung. These are wedged in the thermometric tube by the metal, and thus record the maximum and minimum temperatures reached. Taking readings Sixs' maximum minimum Thermometer in Project Kanna Writes. It measures temperature in increments of one decimal place and is accurate to ±1°C. day. Six's Maximum and Minimum thermometer is a U shaped parallel tube made up of glass. Diagram of six's maximum and minimum thermometer . The bulb at the top of the minimum reading scale arm is full of alcohol, while the other contains a vacuum (or low pressure alcohol vapour). Six’s Maximum and Minimum thermometer is a U shaped parallel tube made up of glass. MAX MIN THERMOMETER - GARDEN GREENHOUSE INDOOR OUTDOOR WALL - 12/428/3. (If the markers are not reset, they will register maxima and minima only if they exceed the values already encountered. In a variation of design, some models have unsprung markers held in place by a magnetic plate located behind the card showing the scales and close enough to the U-shaped tube to hold the markers in place unless they are pushed by the thermal expansion of the device. (44) 44 product ratings - DIGITAL MAX MIN THERMOMETER GARDEN GREENHOUSE INDOOR OUTDOOR BRANNAN - 12/429/3. Subject: meteorology, Maker: Taylor Instrument Companies (1851 - 1992) Supplier: Andrew J. Lloyd Company (fl. A Six's thermometer functions by using alcohol to expand or contract the mercury inside to display both the highest and lowest temperatures of a given time period. When the temperature rises, the alcohol expands and pushes the mercury up the maximum column. They can be used to measure air temperatures. temperature. Classification: Thermometer. place. Want a call from us give your mobile number below, For any content/service related issues please contact on this number. 54 sold. A Stevenson screen or instrument shelter is a shelter or an enclosure to meteorological instruments against precipitation and direct heat radiation from outside sources, while still allowing air to circulate freely around them. Why is the six’s thermometer called minimum and maximum thermometer? It is commonly used wherever a simple way is needed to measure the extremes of temperature at a locat ion, for instance in meteorology and horticulture Traditionally maximum and minimum temperatures were measured using the set-up shown in the photo above. Typically the thermometer is reset every 24 hours to measure the diurnal temperature variation, the positions of the ends of the markers nearest to the mercury are examined. Rights. This thermometer is popular among gardeners for use in greenhouses. Free postage. The thermometer is well made from quality materials and is simple and intuitive to use. Their positions on the maximum and minimum scales show the highest and lowest temperatures encountered since the last reset.[4]. When a manual control is operated, the plate is pushed away from the U-shaped tube, freeing the markers which then drop under gravity to the surface of the mercury. It records the maximum and minimum temperature for the time interval since it was last reset. This is a handy thermometer that clearly displays minimum and maximum temperatures and humidity as well as the current temperature and humidity. The arms of the U-shaped tube terminate in sealed glass bulbs. Its purpose is to record the maximum and minimum temperatures reached since the thermometer was last read. One of these is for recording the maximum temperature encountered and the other for the minimum temperature. The steel indexes are One side registers the maximum temperature and the other side records the minimum temperature. It is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design. Explain the working of ‘Six’s maximum and minimum thermometer’ rises, the alcohol expands and pushes the mercury up the maximum column. Generally speaking, a minimum temperature occurs during the night and a maximum during the day. 2. 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