Will Brexit lead to the abandonment of Crossrail2 and Turning South London Orange?
In article ,
"tim..." wrote:
thermometers are sealed units
(I have no idea about barometers, but assume likewise)
There may be sealed versions but the point about a mercury barometer is
that it's influenced by atmospheric pressure and the most basic version
is an open dish with a long tube immersed in it. I'd guess old versions
are most likely to have mercury open to the atmosphere.
Sam
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