l azimuth of the magnetic needle, and for the ries an apparatus for torsion observations. Moreover, the Sciences (1883). A large sized tablet containing diagrams measurement of deflections and of the duration of oscilla- compass is provided with an aiTangement which permits, relative to these laws… … RAGONA'S POBIABLE ASTRONOMICAL, MAGNETIC, AND METEOROLOGICAL OBSERVATORT. declination is one of Mr. Ragona's own invention. It is en- of the thread. The operation is performed once, at the be- The determination of inclination is effected by means of tirely independent of a knowledge of the hour and…
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