Abstract
THIS part of the Annals of the Lisbon Observatory is a continuation of those noticed in NATURE, vol. xiii. p. 301. The results for the magnetic declination are carried forward from 1867 to 1871, while some include the means from 1858 to 1875. This is the case for the secular change and annual variation. Mr. Capello found previously that the north end of the declination magnet approached the north at the rate of 5′91 yearly (1858–1868). The results he now divides into two series, 1858 to 1866, with a rate of 5.′46, and 1866 to 1875, with a rate of 7.′64 yearly.
Annæs do Observatorio do Infante D. Luiz. Magnetismo Terrestre.
Lisboa, 1876.
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BROUN, J. Annœs do Observatorio do Infante D. Luiz. Magnetismo Terrestre . Nature 16, 139 (1877) doi:10.1038/016139a0
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