NOUN (1)

1. a recording barometer; automatically records on paper the variations in atmospheric pressure;

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]