Well some sane discussions while I've been out .....

unless I've missed the fun ?

Ok ...the idea with the smoke of course is to get the average height before the flow changes from laminar to turbulent ....not till it dissipates. That achieved you will then need to change the air ie humidity and see if that has any quantifiable effects ....

Isn't it strange ...none of the naysayers have asked me to bring the unit over to them .....I find that speaks greater volumes that all the hyperbola....

As to the 1/3's..... dave thats about how I set your distances interesting  as we did it by ear and rod !...my room is also set on those ratios...