Quote:
Originally Posted by Richard_FM
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There's a serious error in that article:
quote:
Mercury, which is poisonous, is used as a getter to absorb any remaining oxygen molecules in valves; this is what causes the internal silvering on some valves.
:end quote
It's usually Barium. Heated up Mercury would vapourise and have the opposite effect of a getter.
I wonder if that article has any bearing on the unhappy tales of very expensive valves being destroyed by a certain export shipping agent as "containing hazardous substances".