rec.photo.darkroom

Subject: Re: Calibrated Thermometers

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On Mon, 08 May 2006 19:11:05 -0400, "Greg "_""
posited:

>? Thoughts [calibrating/ed thermometers ????]

You can always stick it up your a---. Should
be 98.6 +-.

Fever thermometers are accurate to +- .2 degrees
and make good calibration standards: put both
thermomters in hot water in a styrofoam cup -
keep the water gently stirred.

Only color photography is sensitive to
temperature, and that gets processed at 100
same as body temperature: they are both organic
chemistry.

B&W is a +-2 F game, and you only need
to have a repeatable temperature and the ability
to read the deviation to +-10%. A grossly
inaccurate thermometer will do as long as
it is linear.

Temperature calibration is tough to do with
great accuracy. A triple-point ice cell is
the only common temperature reference.

http://www.its-90.com/wtpguide.html
http://www.omega.com/ppt/pptsc.asp?ref=TRCIII&Nav=temk03

If you would rather have someone else calibrate your
thermometer:

http://www.omega.com/toc_asp/frameset.html?book=Temperature&file=INTRO_GLASS_THERM

Or buy a 'Kodak Color Thermometer' or 'Kodak Process Thermometer' on
ebay and be as Alfred E. Neumann: "What, me worry?"

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics, Photonics, Informatics.
Remove blanks to reply: n o lindan at ix . netcom . com
f-Stop enlarging timers: http://www.nolindan.com/da/fstop/



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