/ Bubble in compass
Last weekend on using my back up compass I noticed a bubble in it. Since then I bought another compass. Both Silva.
Now the bubble has gone from the first compass! How does that happen? Will the bubble return!
I have had this and Silva say if the bubble is small (below 1/4" iirc) it's ok. It's due to atmospheric or temperature changes. Having said that, I always carry a spare compass after once leaving mine sitting on a rock on Skye! :-(
I've had similar issues with silva compasses, again, I had two with me and both had the same problem.
I was also told by silva that it was due to atmospheric pressure and temperature. This would seem to make sense as the bubbles only appear on very cold clear days.
I noticed last weekend for the first time that my Suunto compass has a (very) small bubble - it's around 15 yrs old.
My original compass (inherited off my Dad) had a big bubble and TBH so long as you jiggled it so the needle wasn't resting on the bubble there was no problem with reliability/accuracy
Someone told me the bubble was quite normal, that it allowed for expansion or contraction as temperature changed and avoids the compass bursting - gas being compressible but not liquid.
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