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I've seen these things on quite a bit of older equipment, "Time
totalizers" consisting of a glass tube filled with a murcury bubble that
moves maybe an inch over 5000 hours. For instance the one at the bottom
of this page:

http://www.surplussales.com/Meters/MtrTime.html

I'm curious, do they still make them? How do they work anyway?

- -- 
http://petertodd.ca
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