Signedunsigned
InscribedIn envelope marked: Replaced by stronger spider cut from dural (?) used after 1943- use as a pattern for new sails.
FunctionThese are the sails, or vanes of a cinemograph mill, or integrating anemomenter. An instrument for measuring wind speed.
Historical AttributesPart of the first cinemograph mill used at Blue Hill Meteorological Observatory.
ProvenanceFrom the Blue Hill Meteorological Observatory, November, 1958.
Published ReferencesA mention of this type of instrument is made in: The Blue Hill Meteorological Observatory: The First 100 Years - 1885-1985, John H. Conover, American Meteorological Society, 1990, p.261, Fig. 118.