The greenhouse effect: radiant transmittance of glass

The equipment shown in the photo is used to introduce students to the theory of the Greenhouse Effect. With the energized soldering iron placed several feet in front of the radiation thermopile, one obtains full-scale deflection on the galvanometer. A lab jack is then used to support a piece of high quality optical glass (about 1" thick) that is large enough to completely cover the reflecting cone associated with the radiometer.

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