At 3:07 PM -0800 1/1/98, Paul Goelz wrote:
>... I want to measure the temperature of
>the glass towards the center, where it is likely cooler than at the edges.
>It doesn't help to measure the edge of the glass if the center is cooler
>(farther from the heat source) and therefore may dew up...

Yes, but it is likely that the temperature gradient across the corrector is
pretty constant. If you measure it at the edge you have indirectly
measured it at the center. Just adjust the heater to keep the edge warm
enough that the center doesn't dew up. (I'm assuming the heater controller
will have an adjustable delta between the ambient and the setpoint.)

---
Bill Arnett "Science is a way of trying
San Jose, CA USA not to fool yourself." -- Feynman

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