What is this?

[dman]

There is a graph being charted by some instrument on this video...anyone know what is measuring? 42 secs in

http://www.youtube.com/watch?v=NE_ri8PkihE&feature=related

[WestVanHan]

My guess is it's the bottom falling out of the barometer...

[Itchy&Scratchy]

Its a barograph and measures and records barometric pressures.

[dman]

Thanks everyone..barograph..:)