Source : Webster's Revised Unabridged Dictionary (1913)

Baroscope \Bar"o*scope\, n. [Gr. ? weight + -scope: cf. F.
   baroscope.]
   Any instrument showing the changes in the weight of the
   atmosphere; also, less appropriately, any instrument that
   indicates -or foreshadows changes of the weather, as a deep
   vial of liquid holding in suspension some substance which
   rises and falls with atmospheric changes.