A sling psychrometer (which is a hygrometer) measures the moisture content of the atmosphere surrounding it. It is called a sling psychrometer because it is whirled around in the air until a constant value/reading is obtained from the wet-bulb thermometer.
A sling (for throwing stones).
The Richter Scale is used to determine the earthquake density. The scale is measured from low as 1 to high as 10.
sling
Richter
Mass
The sling psychrometer was invented in 1887 by Adolph Richard Assmann, a German meteorologist. It is a simple instrument used to measure the relative humidity of the air.
At Hardwere Stores:)
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It measures humidity
Leonardo da vici (the artist) built the first crude hygrometer in the 1400s and francesco folli invented a more practical hygrometer Leonardo da vinci
Relative humidity
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There are a lot of places to buy a sling psychrometer. Any company which sells scientific equipment should have them, or one could buy it from Amazon or Bacharach.
The basic design of the sling psychrometer has remained relatively unchanged over time. However, there have been advancements in materials used and the addition of digital features for more precise measurements. Overall, the principles of using wet and dry bulb thermometers to measure relative humidity remain the same.
One of the better ways would be to use a sling psychrometer.
There are two types - the wet-bulb sling psychrometer and the dry-bulb psychrometer. Look up the definitions of these instruments for more details.
psychrometera hygrometer would be useful!