Does anyone know how to get bubbles out of the thread of a Met.Office
pattern minimum thermometer? Actually, I do know how it’s usually done.
You gently heat the thermometer and the expanding alcohol carries the
bubbles up to the reservoir at the top, where they disappear. I’ve done two
successfully, but the trouble this time is that the bubbles are in the lower
half of the scale and there seems no way I’m going to get them up to the top
by heating.

Ian Bingham,
Inchmarlo, Aberdeenshire.