Usual nothing-to-do-with-LR question from me as the chances are high that someone will know the answer (and enjoy supplying it!):
Collecting a mercury barometer tomorrow. This particular model has a layer of coloured indicating fluid sitting on the mercury.
Calibration is achieved by altering the quantity of indicating fluid by means of a syringe and fine tube. Then you add a small quantity of ether down the side of the tube to clean off any indicationg fluid. As the ether evaporates it cleans the inner wall of the tube and prevents the indicating fluid dragging on the wall as its level drops.
So, the problem is: where to buy ether? It's anaesthetic properties mean that you can't buy it over the counter - or at least nowhere I tried.
If all else fails I will try to get a private prescription from my GP as it is availablr from chemists on prescription. However, I don't hold out much hope of that.
TIA
Richard