pparatus for torsion observations, Moreover, the strumental azimuth of the magnetic needle, and for the Sciences (1883). A large sized tablet containing diagrams measurement of deflections and of the duration of oscilla- compass is provided with an arrangement which permits, relative to these laws… … 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 ofthe hour and of the ginning of the voyage, and before starting thereon. In fact, an…
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