Chris,
This is real good work. But this tells us something that we have all been doing wrong. We have been using small flames. I guess we all figured it would react better and go out when the air is bad if the flame is small. But then again, you can't see the changes in height as well with a small flame.
After reading this, I did a test. I lite my lamp, setup a large 1 inch flame. I held my breath for like two minutes and breathed into the lamp. You can see the effects of the low oxygen right away on the flame just like you stated (I've done the same thing on my O2 meter in the past to see how it reacts to low O2). If memory serves, I think I have gotten the MSA Passport meter down to the low 12's by breathing on it if I hold my breath for a long time. I guess I can test it again to see..
Greg
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