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I appreciate the ideas
I have that same annoying bubble floating at the glass dome of my compass, distorting the magnetic reading.
Thanks for the info on the liquids used and the possibility of doing it myself.
I don't know if I totally agree or perhaps I'm ignorant of the physics/chemistry involved here.
You mentioned, after filling the compass you place it in the freezer and a bubble should reform as the air dissolved in the liquid is forced out. Usually gases are more soluble at lower temperatures, ie warm a bottle of carbonated coke before opening and you'll have a virtual volcano. Perhaps that's not true for the liquid in question??
On the other hand, the new air bubble might be caused by the contraction of the liquid during cooling, resulting in the appearance of the bubble.
Actually come to think of it you may be right, the vacuum pulling out dissolved air and liquid vapor.
So there you go, thanks. I'll give it a shot.
Paul
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