barograph

from WordNet (r) 3.0 (2006)

barograph
    n 1: a recording barometer; automatically records on paper the
         variations in atmospheric pressure

from The Collaborative International Dictionary of English v.0.48

Barograph \Bar"o*graph\ (b[.a]*r[=o]"k[-o]), n. [Gr. ba`ros
   weight + -graph.] (Meteor.)
   An instrument for recording automatically the variations of
   atmospheric pressure.
   [1913 Webster]