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Excerpt from Postos Meteorologicos, 1876: Primeiro Semestre; Annexos Aos Annaes do Observatorio do Infante D. Luiz
Nos Postos da Guarda, Porto, Evora, Lagos e S. Thomé, a duração da exposição do papel ozo llolneti'ico, ao ar livre, para a determinação do grau ozonometrico, é de vinte e quatro ho ras, cotadas das 3 da tarde as 3 da tarde. As medias do ozone n'estes postos, não são pois, comparaveis com as obtidas em Campo - Maior,, Funclial, Ponta Delgada e Angra do Heroismo.
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