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Functionthe sunshine recorder is designed to record how much sunshine or cloud cover was present in a day. As noted in, The Blue Hill Meteorological Observatory: The First 100 Years - 1885-1985, John H. Conover, American Meteorological Society, 1990, Appendix B, pg 437, No. 60, "Made for use on five successive days. (For noon-sunset only)."
Published ReferencesThe Blue Hill Meteorological Observatory: The First 100 Years - 1885-1985, John H. Conover, American Meteorological Society, 1990, pg 437, Item 60.