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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.
when was the sing psychrometer invente
At Hardwere Stores:)
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It measures humidity
Relative humidity
A
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.
Loss of heat of evaporation from the wet bulb. (The reason you "sling it around" is to speed up the evaporation.)
it has changed a lot
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.