The Collaborative International Dictionary of English v.0.48:

Anemoscope \A*nem"o*scope\, n. [Gr. ? wind + -scope: cf. F.
   an['e]moscope.]
   An instrument which shows the direction of the wind; a wind
   vane; a weathercock; -- usually applied to a contrivance
   consisting of a vane above, connected in the building with a
   dial or index with pointers to show the changes of the wind.
   [1913 Webster]