A dry and wet bulb thermometer works via being moisturized in conjunction with a wet cotton swab which would evaporate. From there, the temperatures are recorded before more recordings for other temperatures are done with a psychometric chat regarding one's findings with the dry and wet bulb thermometer.
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"Wet on wet" or "wet in wet" means that you are applying wet paint (usually oil, artist's colours) to a surface that you have already painted which is still wet. If using oil, then your surface would be oil based, such as linseed oil or turpentine. This technique enables you to move and blend the paint to finish a painting in one sitting. "Wet on dry" means you are applying wet paint to a dry surface that you have painted earlier and allowed to dry. You can do this to either build up an area, or as in glazing, to achieve certain effects.
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.
Wet glazing uses some kind of putty or sealant that needs to dry or cure. Dry glazing uses a rubber strip or similar, that goes on dry and stays that way.
Painting on dry plaster as opposed to painting on wet plaster. Painting on wet plaster is more permanent because the paint is infused with the plaster.
dry it out