Quote:
Originally Posted by Vanda
Oh come on I hate suspense! How about a clue? Its a piece of a? The spring connected to something?
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If I give a clue, it'll probably give it away, but here goes, RCA, 1931.
Quote:
Originally Posted by M54
Is it some kind of pull cord light switch???
Or something to do with a pinball machine? 
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No, but sort of close on the first guess, nowhere near on the 2nd part though ;-)
Quote:
Originally Posted by DavidU
The underneath of some gas appliance or refrigeration?
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Sorta close - this does have gas in it.
Hope that helps ;-)
Cheers,
Dave
edit: you don't see these very much these days, and an original RCA would set you back anywhere up to US 1k or more sometimes, especially for the military spec versions. 2nd edit: these can be deadly too - with 1250v or higher involved. Do the wrong thing and you're dead. They were once very very very common.