What is the Device Behind Alan Harper's Head?

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In tonight's Two and a Half Men, I spotted a familiar device behind Alan Harper's head:
A barograph. It is a pen device attached to an aneroid barometer that creates a tracing of the barometric pressure. The paper chart is typically changed once a week. Here are the essential parts:
click to enlarge
Bet you didn't know you could learn about weather instruments from watching network TV? Until tonight, neither did I.

This model barograph was sold by Taylor Instruments when I was a kid. You can see a closeup photo here.

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