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Autor(en): 
  • Charles Anthony Schott
  • Methods and Results: Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations, Appendix No. 12, Report for 1886 
     

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    Übersicht
     
    Lieferstatus:   i.d.R. innert 5-10 Tagen versandfertig
    Genre:  Wirtschaft / Recht 
    ISBN:  9780331822397 
    EAN-Code: 
    9780331822397 
    Verlag:  Forgotten Books 
    Einband:  Kartoniert  
    Sprache:  English  
    Dimensionen:  H 229 mm / B 152 mm / D 7 mm 
    Gewicht:  186 gr 
    Seiten:  130 
    Zus. Info:  23:B&W 6 x 9 in or 229 x 152 mm Perfect Bound on White w/Gloss Lam 
    Bewertung: Titel bewerten / Meinung schreiben
    Inhalt:
    Excerpt from Methods and Results: Secular Variation of the Magnetic Declination in the United States and at Some Foreign Stations; Appendix No. 12, Report for 1886

    The practical nature of the inquiry, and the necessity of looking to the publications of the Coast and Geodetic Survey to supply the latest information on the subject of the changes, secular and otherwise, of the direction of the magnetic needle, has caused an ever-increasing demand for these investigations of the survey, and this has acted again as a stimulus to advance our knowl edge Of the secular changes of the magnetic force, both for direction and intensity. It thus becomes necessary every few years to re-discuss or submit to analysis any additional observations, as well as to direct such observations to be made at those places where they may contribute most, effectively towards the elucidation of the laws of change.

    Appendix No. 6, Coast and Geodetic Survey Report for 1885, contains an exhaustive article on the secular change of the magnetic dip and the magnetic intensity, as observed in the United States from the earliest to the present time. It is accompanied by three maps, showing the actual! Distribution of these magnetic elements for the epoch 1885-0 This, together with the present communication, completes the inquiry in this branch of knowledge by bringing it up to date.

    During the five years which have elapsed since the last issue of this paper the available material for the discussion of the secular variation of the declination has greatly increased, bring: ing up the number of stations contained in this edition to 94 and the number of declinations to 1071, for each of which full reference is given, as well as a comparison of the observed and com pated values. The average number of observations for a station is 11. It is satisfactory to remark that this increase of observations was found greatly to improve the values of the analytical expres sions, giving greater accuracy to the results deduced and tending to greater uniformity in such phases of the secular variation as the amplitude of the motion and the epochs of maxima and minima or times of magnetic elongation, all of which depend on the geographical position of the stations.

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