Quote:
Originally Posted by Topspinmo
wet bulb procedures. Basically we had thermometer that we could wet cloth then spin it close to intake of engine, after minute or two the water evaporates and gives true ambient temperature at that location. .
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Those are called Sling Psychrometers. The original kind are pretty expensive (I think in the neighborhood of $150) but you can get cheap digital ones that work pretty well for $25. If you get one spend a little extra and get a psychometric chart (and instructional book). You will learn all you ever care to know about water content of air and how it behaves in concert with temperature.