Abstract
My letter of August 5, 1881, which appeared in NATURE, vol. xxiv. p. 508, stated that a considerable group of sun-spots burst into appearance between 4 and 5 p.m. (about) on July 25, 1881; or more exactly that the new group was absent at 3h. 58m. (i.e. in negative No. 1175), but was present at 4h, 47m. (i.e. in negative 1176), local apparent time; further, that no additional negatives could be taken here until July 30, when the spots had disappeared.
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HENNESSEY, J. Outburst of Sun-Spots, July 25, 1881. Nature 25, 241 (1882). https://doi.org/10.1038/025241b0
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DOI: https://doi.org/10.1038/025241b0