Abstract
THIS volume contains the results that have been obtained from the magnetic observations taken at the Naval Observatory during the years 1888 and 1889. The instruments with which they were made were, in the year 1887, placed in their respective buildings that had been erected for that purpose by the Bureau of Navigation. In the construction of these buildings the greatest care was taken to insure the complete elimination of local disturbances. No iron or any magnetic material was used at all, and the fastenings, &c., were entirely of copper, brass, and wood; even the stoves, in which only wood was burnt, were of soap-stone, with copper pipes.
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Washington Magnetic Observations, 18861. Nature 44, 91 (1891). https://doi.org/10.1038/044091a0
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DOI: https://doi.org/10.1038/044091a0