In a message dated 3/11/2005 9:10:38 P.M. Eastern Standard Time,
johnaire@xxxxxxxxxxxxxxx writes:
Hi to ALL,
I have this Humidity Instrument I
found a couple of years ago. It is made by the George Instrument
Co. It plugs into the lighter socket in the vehicle and has a switch on
it. The switch controls a small fan motor which blows over a small glass
bottle with a wick in it. The bottle would contain water. It has a
slide scale on the front to figure the humidity on it. There must have
been some sort of temperature measuring device on this. Does any one
know or have heard of this piece of test equipment?
Jack in Shinglehouse, Pa
Yes, it is called a "Wet Bulb" thermometer. Usually its reading is
compared with a "Dry Bulb" thermometer to figure relative humidity, as you
say.
It is a standard piece of laboratory equipment, but I've no idea why one
would be made to plug into a cigarette lighter.
At Chrysler Engineering Carburetor Lab, we took readings twice a day in
conjunction with another instrument (Barometer, maybe) and calculated density of
the air for use with our carburetor flow stands, which were "Positive
Displacement" units.
Unfortunately, it's been too long for me to give more details.
Joe Savard
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