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<blockquote data-quote="Sidewinder" data-source="post: 352293" data-attributes="member: 9512"><p>I'm amazed that the filament on those lamps has not oxidised as the glass envelope is basically evacuated, to prevent oxidation of the tungsten filament, once the envelope cracks then the atmosphere can enter the envelope, thus offering oxygen to the filament to allow it to oxidise and deteriorate.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 352293, member: 9512"] I'm amazed that the filament on those lamps has not oxidised as the glass envelope is basically evacuated, to prevent oxidation of the tungsten filament, once the envelope cracks then the atmosphere can enter the envelope, thus offering oxygen to the filament to allow it to oxidise and deteriorate. [/QUOTE]
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