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Originally Posted by Incoherent
Not quite sure what you mean Les.
The chart above is for a 70W load, sorry did not note that last night.
My "hemisphere" is actually a 34mm (ish) diameter flattened top shape 12mm high. This complicates the area calculation a bit.
does that help?
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Some.
Not much progress and ,probably, still lacking in clarity
However
Probably as far as I can get without progressing from sums to mathematics(35years of rust)
Probably will not pursue further.
Do still agree that,particularly at low h, the dome should lower DeltaT - but the numbers elude me.
In consequence concur with most of your reply to Cathar.