20 Tallene i den sidste Rubrik, den devierende Misvis- ning, afsattes som Ordinater paa Rudepapir, med Tallene i den anden Rubrik, anlagt Kurs paa Standard-Kompas, som Argument. Paa grafisk Vej droges mellem de afsatte Punkter den sandsynligste Kurve, og af denne Kurve ud- toges Iblgende Yserdier: C — Anlagt Kurs efter St. Kom- p'asset. D — Devierende Misvisning The figures in the last column, the deviating‘varia-r tion, were set down as ordinates on ruled paper, with the figures in the second column as abscisste. A free hand curve was then drawn as nearly as possible through all the marked points, and from this curve were deduced the following values (C Signifies “course by compass;” D, “de- viating variation”): — c D C D c D c D N 00 © 00 W E 37-° 0 w s 17/8 W w 0/4 w M o o 21. 3 S 8o° E 37' 4 s & 0 0 13-8 N 8o°W i. 6 20 23. 8 70 37- 3 20 10. 0 70 3- 3 30 26. 1 60 36. 6 30 6 6 60 5- 2 40 28. 4 50 35- 2 40 3.8. 50 7- 2 50 30. 8 40 33-0 50 1. 6 40 9. 4 6o 33- 1 30 30. 0 60 6. 6 30 11. 8 70 35- 0 20 26. 5 70 O. I 20 14. 0 8o 36- 4 10 2 2.1 80 O. O IO 16. 5 Medium af de devierende Misvisninger i denne Tabel er 18.°68 West. Ifolge Side 7 var Middel-Misvisningen paa Teltpladsen paa samrne Tid 18° 14/7 = 18°.24. Paa Skjmret ostenfor Havnen fandt Prof. Mohn (Side 11) den 16de Juni Misvisningen om Formiddagen = 19° O', om Eftermiddagen 18° 2', i Middel 18° 31' = 18°,52. Da Far to jet under Svingningen laa mellem Teltpladsen og Skjseret, turde’ det vmre rigtigst at smtte Misvisningen paa Skibets Plads lig . 18/38 West. t Dette Tal er kun 0/30 mindre end Middeltallet af de devierende Misvisninger ombord. Det sidste giver saa- ledes den sande Misvisning med en Nojagtighed af mindst en halv Chad. Efter dette Princip udfortes Misvisnings- bestemmelserne i Seen.. Til Bedommelse af Skibets mag- netiske Forhold hidssettes de beregnede Yserdier for Kon- stanterne i Deviations-Formelen. A - 0,°0; B = — 18/47; C = Deviationen er 0 for anlagt Kurs Nord og Syd, Maximum, 18/5, for Ost og West. Misvisnings-Bestemmelserne i Seen udfortes paa fol- gende Maade. Skibet blev, i roligt Yejr og under Solskin, ved Maskine og Ror bragt til at ligge an forskjellige, i Regelen 16, Kurser, saa jevnt som muligt fordelte over hele Horizonten. For liver af disse anlagte Kurser bestem- tes Vinkelen mellem Diametralplanet og' Solens Vertikal- The mean of deviating variation in this Table is 18/68 W. As previously shown, page 11, the mean declination si- multaneously found at the tent was 18° 14/7 = 18/24. On the islet east of the harbour, Professor Mohn found the declination in the forenoon of the 16th of June = 19° O', in the afternoon 18° 2', giving a mean of 18° 31' = 18/52. Now, as the vessel lay when swinging be- tween the tent and the islet, the declination for the ship’s position may be put at 18/38 W. This value is only 0/30 less than the mean of the deviating variations observed on board. Hence, this mean gives the true variation within half a degree. On this prin- ciple was determined the variation at sea. To show the magnetic influence of' the vessel, the computed values of the constants in the deviation formula are here given. — The deviation is 0 with the ship’s head due north or south, its maximum with the ship’s head due east or west being'18/5. The determinations of declination at sea were per- formed as follows: — In calm, bright weather the ship’s head was brought upon different points of the compass, as a rule 16,- as regularly distributed round the circumference as possible. For eacli of these points was determined the angle between the midship line and the vertical circle of — 0/45; D = + 2/47 ; E = -|- 0/23.

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