. Manual of the natural history, geology and physics of Greenland and the neighbouring regions / prepared for the use of the Arctic expedition of 1875, under the direction of the Arctic Committee of the Royal Society and edited by T. Rupert Jones. Together with Instructions suggested by the Arctic Committee of the Royal Society for the use of the expedition / published by authority of the Lords Commissioners of the Admiralty [microform]. Natural history; Scientific expeditions; Sciences naturelles; Expéditions scientifiques. 694 . TKRKK^TRIA!- MAGNETISM Tlie force in London, ns dctciinincd by
. Manual of the natural history, geology and physics of Greenland and the neighbouring regions / prepared for the use of the Arctic expedition of 1875, under the direction of the Arctic Committee of the Royal Society and edited by T. Rupert Jones. Together with Instructions suggested by the Arctic Committee of the Royal Society for the use of the expedition / published by authority of the Lords Commissioners of the Admiralty [microform]. Natural history; Scientific expeditions; Sciences naturelles; Expéditions scientifiques. 694 . TKRKK^TRIA!- MAGNETISM Tlie force in London, ns dctciinincd by llicsunic (li|»|»iiifr ncodlc, iM'ing 100. Tho time of 100 vihrntlons in London wns .V 30" Ixf'oi-o llic ICx- pcdition fslarlcd, and .V ;j(Jo" ulk'i' its return: giving n menu vnhu-of-)' 33;V'. With regard to the diiinnil changes in nil the magnetic elements contrary results uere ohtained at the two winter stations. At Winter i>lantl the declination W., the dip and th(! force were each greater in the morning than in tJic alternoon ; lait at Igloolik each of the three magnetic elements was greater in the afternoon than in the morning. At l)oth stations tho magnetic force increased ns sununer ad- vanced. I;. 4. Pakky's Jourxal of a Third Voyaoe for tlu« Discoveuy of a Noimii-West Passage. () JMinjiu'tic Observations at l^ort liotvm. The dipping needles emjdoyed were three by Jones, 7^ inches in length ; one of which, l)elonging to the same instrument, was em- ployed for intensity, and to another each one of three brass spheres could be attached, by means of which its moment of inertia could be determined. There were also two dipping needles by Dollond, one of which was emj)loyed exclusively for intensity. " The observations for ijilensity, by means of the time in which the needles peribrmod 100 vil)iiitions in the meridian, are deduced from the mean of 400 vibrations obtained with the lace of the instrument on each side of the vertical, and the need
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Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
